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Finding the Fourth Proportional to 520,048.20, 780,072.30 and 485,056.20

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Solution

The fourth proportional to 520,048.20, 780,072.30 and 485,056.20 is: 727,584.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,048.20 : 780,072.30 = 485,056.20 : x
  2. Step 2: Convert to fraction form
    520,048.20/780,072.30 = 485,056.20/x
  3. Step 3: Cross multiply
    520,048.20x = 780,072.30 × 485,056.20
  4. Step 4: Simplify right side
    520,048.20x = 378,378,905,563.26
  5. Step 5: Solve for x
    x = 378,378,905,563.26/520,048.20
  6. Step 6: Final answer
    x = 727,584.30

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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.