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Finding the Fourth Proportional to 91,122.31, 125,680.88 and 66,915.68

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Solution

The fourth proportional to 91,122.31, 125,680.88 and 66,915.68 is: 92,293.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,122.31 : 125,680.88 = 66,915.68 : x
  2. Step 2: Convert to fraction form
    91,122.31/125,680.88 = 66,915.68/x
  3. Step 3: Cross multiply
    91,122.31x = 125,680.88 × 66,915.68
  4. Step 4: Simplify right side
    91,122.31x = 8,410,021,213.62
  5. Step 5: Solve for x
    x = 8,410,021,213.62/91,122.31
  6. Step 6: Final answer
    x = 92,293.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.