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Finding the Fourth Proportional to 390,179.38, 585,315.92 and 137,407.59

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Solution

The fourth proportional to 390,179.38, 585,315.92 and 137,407.59 is: 206,127.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,179.38 : 585,315.92 = 137,407.59 : x
  2. Step 2: Convert to fraction form
    390,179.38/585,315.92 = 137,407.59/x
  3. Step 3: Cross multiply
    390,179.38x = 585,315.92 × 137,407.59
  4. Step 4: Simplify right side
    390,179.38x = 80,426,850,299.35
  5. Step 5: Solve for x
    x = 80,426,850,299.35/390,179.38
  6. Step 6: Final answer
    x = 206,127.89

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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.