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Finding the Fourth Proportional to 138,072.60, 207,108.90 and 76,136.76

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Solution

The fourth proportional to 138,072.60, 207,108.90 and 76,136.76 is: 114,205.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,072.60 : 207,108.90 = 76,136.76 : x
  2. Step 2: Convert to fraction form
    138,072.60/207,108.90 = 76,136.76/x
  3. Step 3: Cross multiply
    138,072.60x = 207,108.90 × 76,136.76
  4. Step 4: Simplify right side
    138,072.60x = 15,768,600,613.16
  5. Step 5: Solve for x
    x = 15,768,600,613.16/138,072.60
  6. Step 6: Final answer
    x = 114,205.14

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1.5x scale

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.