Home / 78,136.68-117,192.06-28,207.20

Finding the Fourth Proportional to 78,136.68, 117,192.06 and 28,207.20

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Solution

The fourth proportional to 78,136.68, 117,192.06 and 28,207.20 is: 42,306.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,136.68 : 117,192.06 = 28,207.20 : x
  2. Step 2: Convert to fraction form
    78,136.68/117,192.06 = 28,207.20/x
  3. Step 3: Cross multiply
    78,136.68x = 117,192.06 × 28,207.20
  4. Step 4: Simplify right side
    78,136.68x = 3,305,659,874.83
  5. Step 5: Solve for x
    x = 3,305,659,874.83/78,136.68
  6. Step 6: Final answer
    x = 42,306.12

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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.