Home / 76,869.38-115,316.18-20,711.68

Finding the Fourth Proportional to 76,869.38, 115,316.18 and 20,711.68

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Solution

The fourth proportional to 76,869.38, 115,316.18 and 20,711.68 is: 31,070.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,869.38 : 115,316.18 = 20,711.68 : x
  2. Step 2: Convert to fraction form
    76,869.38/115,316.18 = 20,711.68/x
  3. Step 3: Cross multiply
    76,869.38x = 115,316.18 × 20,711.68
  4. Step 4: Simplify right side
    76,869.38x = 2,388,391,818.98
  5. Step 5: Solve for x
    x = 2,388,391,818.98/76,869.38
  6. Step 6: Final answer
    x = 31,070.78

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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.