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Finding the Fourth Proportional to 66,600.30, 91,721.31 and 65,148.78

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Solution

The fourth proportional to 66,600.30, 91,721.31 and 65,148.78 is: 89,722.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,600.30 : 91,721.31 = 65,148.78 : x
  2. Step 2: Convert to fraction form
    66,600.30/91,721.31 = 65,148.78/x
  3. Step 3: Cross multiply
    66,600.30x = 91,721.31 × 65,148.78
  4. Step 4: Simplify right side
    66,600.30x = 5,975,531,446.50
  5. Step 5: Solve for x
    x = 5,975,531,446.50/66,600.30
  6. Step 6: Final answer
    x = 89,722.29

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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.