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Finding the Fourth Proportional to 524,139.40, 786,209.10 and 485,648.20

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Solution

The fourth proportional to 524,139.40, 786,209.10 and 485,648.20 is: 728,472.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    524,139.40 : 786,209.10 = 485,648.20 : x
  2. Step 2: Convert to fraction form
    524,139.40/786,209.10 = 485,648.20/x
  3. Step 3: Cross multiply
    524,139.40x = 786,209.10 × 485,648.20
  4. Step 4: Simplify right side
    524,139.40x = 381,821,034,238.62
  5. Step 5: Solve for x
    x = 381,821,034,238.62/524,139.40
  6. Step 6: Final answer
    x = 728,472.30

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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.