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Finding the Fourth Proportional to 212,321.25, 318,531.08 and 72,079.88

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Solution

The fourth proportional to 212,321.25, 318,531.08 and 72,079.88 is: 108,136.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,321.25 : 318,531.08 = 72,079.88 : x
  2. Step 2: Convert to fraction form
    212,321.25/318,531.08 = 72,079.88/x
  3. Step 3: Cross multiply
    212,321.25x = 318,531.08 × 72,079.88
  4. Step 4: Simplify right side
    212,321.25x = 22,959,680,610.21
  5. Step 5: Solve for x
    x = 22,959,680,610.21/212,321.25
  6. Step 6: Final answer
    x = 108,136.52

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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.