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Finding the Fourth Proportional to 137,612.80, 206,419.20 and 85,124.80

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Solution

The fourth proportional to 137,612.80, 206,419.20 and 85,124.80 is: 127,687.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,612.80 : 206,419.20 = 85,124.80 : x
  2. Step 2: Convert to fraction form
    137,612.80/206,419.20 = 85,124.80/x
  3. Step 3: Cross multiply
    137,612.80x = 206,419.20 × 85,124.80
  4. Step 4: Simplify right side
    137,612.80x = 17,571,393,116.16
  5. Step 5: Solve for x
    x = 17,571,393,116.16/137,612.80
  6. Step 6: Final answer
    x = 127,687.20

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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.