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Finding the Fourth Proportional to 109,781.70, 164,672.55 and 72,845.70

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Solution

The fourth proportional to 109,781.70, 164,672.55 and 72,845.70 is: 109,268.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,781.70 : 164,672.55 = 72,845.70 : x
  2. Step 2: Convert to fraction form
    109,781.70/164,672.55 = 72,845.70/x
  3. Step 3: Cross multiply
    109,781.70x = 164,672.55 × 72,845.70
  4. Step 4: Simplify right side
    109,781.70x = 11,995,687,175.54
  5. Step 5: Solve for x
    x = 11,995,687,175.54/109,781.70
  6. Step 6: Final answer
    x = 109,268.55

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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.