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Finding the Fourth Proportional to 138,420.60, 207,630.90 and 137,545.80

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Solution

The fourth proportional to 138,420.60, 207,630.90 and 137,545.80 is: 206,318.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,420.60 : 207,630.90 = 137,545.80 : x
  2. Step 2: Convert to fraction form
    138,420.60/207,630.90 = 137,545.80/x
  3. Step 3: Cross multiply
    138,420.60x = 207,630.90 × 137,545.80
  4. Step 4: Simplify right side
    138,420.60x = 28,558,758,245.22
  5. Step 5: Solve for x
    x = 28,558,758,245.22/138,420.60
  6. Step 6: Final answer
    x = 206,318.70

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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.