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Finding the Fourth Proportional to 615,812.80, 923,719.20 and 378,385.60

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Solution

The fourth proportional to 615,812.80, 923,719.20 and 378,385.60 is: 567,578.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,812.80 : 923,719.20 = 378,385.60 : x
  2. Step 2: Convert to fraction form
    615,812.80/923,719.20 = 378,385.60/x
  3. Step 3: Cross multiply
    615,812.80x = 923,719.20 × 378,385.60
  4. Step 4: Simplify right side
    615,812.80x = 349,522,043,723.52
  5. Step 5: Solve for x
    x = 349,522,043,723.52/615,812.80
  6. Step 6: Final answer
    x = 567,578.40

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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.