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Finding the Fourth Proportional to 261,129.80, 391,719 and 92,633.60

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Solution

The fourth proportional to 261,129.80, 391,719 and 92,633.60 is: 138,959.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,129.80 : 391,719 = 92,633.60 : x
  2. Step 2: Convert to fraction form
    261,129.80/391,719 = 92,633.60/x
  3. Step 3: Cross multiply
    261,129.80x = 391,719 × 92,633.60
  4. Step 4: Simplify right side
    261,129.80x = 36,286,341,158.40
  5. Step 5: Solve for x
    x = 36,286,341,158.40/261,129.80
  6. Step 6: Final answer
    x = 138,959.02

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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.