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Finding the Fourth Proportional to 91,251.30, 136,817.55 and 81,920.10

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Solution

The fourth proportional to 91,251.30, 136,817.55 and 81,920.10 is: 122,826.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,251.30 : 136,817.55 = 81,920.10 : x
  2. Step 2: Convert to fraction form
    91,251.30/136,817.55 = 81,920.10/x
  3. Step 3: Cross multiply
    91,251.30x = 136,817.55 × 81,920.10
  4. Step 4: Simplify right side
    91,251.30x = 11,208,107,377.76
  5. Step 5: Solve for x
    x = 11,208,107,377.76/91,251.30
  6. Step 6: Final answer
    x = 122,826.82

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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.