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Finding the Fourth Proportional to 137,645.70, 206,598.15 and 85,157.70

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Solution

The fourth proportional to 137,645.70, 206,598.15 and 85,157.70 is: 127,816.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,645.70 : 206,598.15 = 85,157.70 : x
  2. Step 2: Convert to fraction form
    137,645.70/206,598.15 = 85,157.70/x
  3. Step 3: Cross multiply
    137,645.70x = 206,598.15 × 85,157.70
  4. Step 4: Simplify right side
    137,645.70x = 17,593,423,278.26
  5. Step 5: Solve for x
    x = 17,593,423,278.26/137,645.70
  6. Step 6: Final answer
    x = 127,816.73

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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.