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Finding the Fourth Proportional to 261,078.40, 391,310.40 and 136,355.20

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Solution

The fourth proportional to 261,078.40, 391,310.40 and 136,355.20 is: 204,372.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,078.40 : 391,310.40 = 136,355.20 : x
  2. Step 2: Convert to fraction form
    261,078.40/391,310.40 = 136,355.20/x
  3. Step 3: Cross multiply
    261,078.40x = 391,310.40 × 136,355.20
  4. Step 4: Simplify right side
    261,078.40x = 53,357,207,854.08
  5. Step 5: Solve for x
    x = 53,357,207,854.08/261,078.40
  6. Step 6: Final answer
    x = 204,372.36

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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.