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Finding the Fourth Proportional to 91,138.68, 136,706.94 and 38,512.44

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Solution

The fourth proportional to 91,138.68, 136,706.94 and 38,512.44 is: 57,768.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,138.68 : 136,706.94 = 38,512.44 : x
  2. Step 2: Convert to fraction form
    91,138.68/136,706.94 = 38,512.44/x
  3. Step 3: Cross multiply
    91,138.68x = 136,706.94 × 38,512.44
  4. Step 4: Simplify right side
    91,138.68x = 5,264,917,824.33
  5. Step 5: Solve for x
    x = 5,264,917,824.33/91,138.68
  6. Step 6: Final answer
    x = 57,768.20

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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.