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Finding the Fourth Proportional to 86,534.92, 129,860.70 and 39,162.88

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Solution

The fourth proportional to 86,534.92, 129,860.70 and 39,162.88 is: 58,770.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,534.92 : 129,860.70 = 39,162.88 : x
  2. Step 2: Convert to fraction form
    86,534.92/129,860.70 = 39,162.88/x
  3. Step 3: Cross multiply
    86,534.92x = 129,860.70 × 39,162.88
  4. Step 4: Simplify right side
    86,534.92x = 5,085,719,010.82
  5. Step 5: Solve for x
    x = 5,085,719,010.82/86,534.92
  6. Step 6: Final answer
    x = 58,770.71

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1.5x scale

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.