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Finding the Fourth Proportional to 390,139.10, 538,425.11 and 220,404.38

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Solution

The fourth proportional to 390,139.10, 538,425.11 and 220,404.38 is: 304,176.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,139.10 : 538,425.11 = 220,404.38 : x
  2. Step 2: Convert to fraction form
    390,139.10/538,425.11 = 220,404.38/x
  3. Step 3: Cross multiply
    390,139.10x = 538,425.11 × 220,404.38
  4. Step 4: Simplify right side
    390,139.10x = 118,671,252,545.98
  5. Step 5: Solve for x
    x = 118,671,252,545.98/390,139.10
  6. Step 6: Final answer
    x = 304,176.77

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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.