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Finding the Fourth Proportional to 79,687.80, 119,531.70 and 57,655.80

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Solution

The fourth proportional to 79,687.80, 119,531.70 and 57,655.80 is: 86,483.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,687.80 : 119,531.70 = 57,655.80 : x
  2. Step 2: Convert to fraction form
    79,687.80/119,531.70 = 57,655.80/x
  3. Step 3: Cross multiply
    79,687.80x = 119,531.70 × 57,655.80
  4. Step 4: Simplify right side
    79,687.80x = 6,891,695,788.86
  5. Step 5: Solve for x
    x = 6,891,695,788.86/79,687.80
  6. Step 6: Final answer
    x = 86,483.70

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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.