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Finding the Fourth Proportional to 86,388.46, 129,620.13 and 42,053.74

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Solution

The fourth proportional to 86,388.46, 129,620.13 and 42,053.74 is: 63,098.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,388.46 : 129,620.13 = 42,053.74 : x
  2. Step 2: Convert to fraction form
    86,388.46/129,620.13 = 42,053.74/x
  3. Step 3: Cross multiply
    86,388.46x = 129,620.13 × 42,053.74
  4. Step 4: Simplify right side
    86,388.46x = 5,451,011,245.79
  5. Step 5: Solve for x
    x = 5,451,011,245.79/86,388.46
  6. Step 6: Final answer
    x = 63,098.84

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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.