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Finding the Fourth Proportional to 91,799.40, 137,439.90 and 89,207.40

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Solution

The fourth proportional to 91,799.40, 137,439.90 and 89,207.40 is: 133,559.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,799.40 : 137,439.90 = 89,207.40 : x
  2. Step 2: Convert to fraction form
    91,799.40/137,439.90 = 89,207.40/x
  3. Step 3: Cross multiply
    91,799.40x = 137,439.90 × 89,207.40
  4. Step 4: Simplify right side
    91,799.40x = 12,260,656,135.26
  5. Step 5: Solve for x
    x = 12,260,656,135.26/91,799.40
  6. Step 6: Final answer
    x = 133,559.22

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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.