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Finding the Fourth Proportional to 66,104.85, 99,136.20 and 21,721.30

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Solution

The fourth proportional to 66,104.85, 99,136.20 and 21,721.30 is: 32,575.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,104.85 : 99,136.20 = 21,721.30 : x
  2. Step 2: Convert to fraction form
    66,104.85/99,136.20 = 21,721.30/x
  3. Step 3: Cross multiply
    66,104.85x = 99,136.20 × 21,721.30
  4. Step 4: Simplify right side
    66,104.85x = 2,153,367,141.06
  5. Step 5: Solve for x
    x = 2,153,367,141.06/66,104.85
  6. Step 6: Final answer
    x = 32,575.02

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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.