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Finding the Fourth Proportional to 91,720.30, 137,580.45 and 82,862.95

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Solution

The fourth proportional to 91,720.30, 137,580.45 and 82,862.95 is: 124,294.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,720.30 : 137,580.45 = 82,862.95 : x
  2. Step 2: Convert to fraction form
    91,720.30/137,580.45 = 82,862.95/x
  3. Step 3: Cross multiply
    91,720.30x = 137,580.45 × 82,862.95
  4. Step 4: Simplify right side
    91,720.30x = 11,400,321,949.33
  5. Step 5: Solve for x
    x = 11,400,321,949.33/91,720.30
  6. Step 6: Final answer
    x = 124,294.43

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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.