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Finding the Fourth Proportional to 91,799.70, 137,780.55 and 54,312.90

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Solution

The fourth proportional to 91,799.70, 137,780.55 and 54,312.90 is: 81,517.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,799.70 : 137,780.55 = 54,312.90 : x
  2. Step 2: Convert to fraction form
    91,799.70/137,780.55 = 54,312.90/x
  3. Step 3: Cross multiply
    91,799.70x = 137,780.55 × 54,312.90
  4. Step 4: Simplify right side
    91,799.70x = 7,483,261,234.10
  5. Step 5: Solve for x
    x = 7,483,261,234.10/91,799.70
  6. Step 6: Final answer
    x = 81,517.27

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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.