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Finding the Fourth Proportional to 71,787.76, 99,066.09 and 39,956.65

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Solution

The fourth proportional to 71,787.76, 99,066.09 and 39,956.65 is: 55,139.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,787.76 : 99,066.09 = 39,956.65 : x
  2. Step 2: Convert to fraction form
    71,787.76/99,066.09 = 39,956.65/x
  3. Step 3: Cross multiply
    71,787.76x = 99,066.09 × 39,956.65
  4. Step 4: Simplify right side
    71,787.76x = 3,958,349,085.00
  5. Step 5: Solve for x
    x = 3,958,349,085.00/71,787.76
  6. Step 6: Final answer
    x = 55,139.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.