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Finding the Fourth Proportional to 86,522.80, 129,857.10 and 39,210.70

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Solution

The fourth proportional to 86,522.80, 129,857.10 and 39,210.70 is: 58,849.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,522.80 : 129,857.10 = 39,210.70 : x
  2. Step 2: Convert to fraction form
    86,522.80/129,857.10 = 39,210.70/x
  3. Step 3: Cross multiply
    86,522.80x = 129,857.10 × 39,210.70
  4. Step 4: Simplify right side
    86,522.80x = 5,091,787,790.97
  5. Step 5: Solve for x
    x = 5,091,787,790.97/86,522.80
  6. Step 6: Final answer
    x = 58,849.09

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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.