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Finding the Fourth Proportional to 81,915.90, 123,003.45 and 59,883.90

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Solution

The fourth proportional to 81,915.90, 123,003.45 and 59,883.90 is: 89,920.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,915.90 : 123,003.45 = 59,883.90 : x
  2. Step 2: Convert to fraction form
    81,915.90/123,003.45 = 59,883.90/x
  3. Step 3: Cross multiply
    81,915.90x = 123,003.45 × 59,883.90
  4. Step 4: Simplify right side
    81,915.90x = 7,365,926,299.46
  5. Step 5: Solve for x
    x = 7,365,926,299.46/81,915.90
  6. Step 6: Final answer
    x = 89,920.59

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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.