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Finding the Fourth Proportional to 137,937.40, 206,906.10 and 81,950.20

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Solution

The fourth proportional to 137,937.40, 206,906.10 and 81,950.20 is: 122,925.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,937.40 : 206,906.10 = 81,950.20 : x
  2. Step 2: Convert to fraction form
    137,937.40/206,906.10 = 81,950.20/x
  3. Step 3: Cross multiply
    137,937.40x = 206,906.10 × 81,950.20
  4. Step 4: Simplify right side
    137,937.40x = 16,955,996,276.22
  5. Step 5: Solve for x
    x = 16,955,996,276.22/137,937.40
  6. Step 6: Final answer
    x = 122,925.30

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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.