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Finding the Fourth Proportional to 91,275.90, 136,690.30 and 75,383.70

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Solution

The fourth proportional to 91,275.90, 136,690.30 and 75,383.70 is: 112,890.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,275.90 : 136,690.30 = 75,383.70 : x
  2. Step 2: Convert to fraction form
    91,275.90/136,690.30 = 75,383.70/x
  3. Step 3: Cross multiply
    91,275.90x = 136,690.30 × 75,383.70
  4. Step 4: Simplify right side
    91,275.90x = 10,304,220,568.11
  5. Step 5: Solve for x
    x = 10,304,220,568.11/91,275.90
  6. Step 6: Final answer
    x = 112,890.92

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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.