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Finding the Fourth Proportional to 61,129.98, 91,708.74 and 21,687.03

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Solution

The fourth proportional to 61,129.98, 91,708.74 and 21,687.03 is: 32,535.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,129.98 : 91,708.74 = 21,687.03 : x
  2. Step 2: Convert to fraction form
    61,129.98/91,708.74 = 21,687.03/x
  3. Step 3: Cross multiply
    61,129.98x = 91,708.74 × 21,687.03
  4. Step 4: Simplify right side
    61,129.98x = 1,988,890,195.64
  5. Step 5: Solve for x
    x = 1,988,890,195.64/61,129.98
  6. Step 6: Final answer
    x = 32,535.43

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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.