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Finding the Fourth Proportional to 138,626.80, 207,940.20 and 129,878.80

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Solution

The fourth proportional to 138,626.80, 207,940.20 and 129,878.80 is: 194,818.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,626.80 : 207,940.20 = 129,878.80 : x
  2. Step 2: Convert to fraction form
    138,626.80/207,940.20 = 129,878.80/x
  3. Step 3: Cross multiply
    138,626.80x = 207,940.20 × 129,878.80
  4. Step 4: Simplify right side
    138,626.80x = 27,007,023,647.76
  5. Step 5: Solve for x
    x = 27,007,023,647.76/138,626.80
  6. Step 6: Final answer
    x = 194,818.20

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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.