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Finding the Fourth Proportional to 672,921.47, 928,605.87 and 371,115.47

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Solution

The fourth proportional to 672,921.47, 928,605.87 and 371,115.47 is: 512,125.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,921.47 : 928,605.87 = 371,115.47 : x
  2. Step 2: Convert to fraction form
    672,921.47/928,605.87 = 371,115.47/x
  3. Step 3: Cross multiply
    672,921.47x = 928,605.87 × 371,115.47
  4. Step 4: Simplify right side
    672,921.47x = 344,620,006,211.32
  5. Step 5: Solve for x
    x = 344,620,006,211.32/672,921.47
  6. Step 6: Final answer
    x = 512,125.14

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.