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Finding the Fourth Proportional to 85,898.80, 129,193.80 and 76,913.20

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Solution

The fourth proportional to 85,898.80, 129,193.80 and 76,913.20 is: 115,679.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,898.80 : 129,193.80 = 76,913.20 : x
  2. Step 2: Convert to fraction form
    85,898.80/129,193.80 = 76,913.20/x
  3. Step 3: Cross multiply
    85,898.80x = 129,193.80 × 76,913.20
  4. Step 4: Simplify right side
    85,898.80x = 9,936,708,578.16
  5. Step 5: Solve for x
    x = 9,936,708,578.16/85,898.80
  6. Step 6: Final answer
    x = 115,679.25

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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.