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Finding the Fourth Proportional to 615,936.80, 923,905.20 and 512,256.80

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Solution

The fourth proportional to 615,936.80, 923,905.20 and 512,256.80 is: 768,385.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,936.80 : 923,905.20 = 512,256.80 : x
  2. Step 2: Convert to fraction form
    615,936.80/923,905.20 = 512,256.80/x
  3. Step 3: Cross multiply
    615,936.80x = 923,905.20 × 512,256.80
  4. Step 4: Simplify right side
    615,936.80x = 473,276,721,255.36
  5. Step 5: Solve for x
    x = 473,276,721,255.36/615,936.80
  6. Step 6: Final answer
    x = 768,385.20

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.