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Finding the Fourth Proportional to 91,008.70, 136,513.05 and 71,981.80

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Solution

The fourth proportional to 91,008.70, 136,513.05 and 71,981.80 is: 107,972.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,008.70 : 136,513.05 = 71,981.80 : x
  2. Step 2: Convert to fraction form
    91,008.70/136,513.05 = 71,981.80/x
  3. Step 3: Cross multiply
    91,008.70x = 136,513.05 × 71,981.80
  4. Step 4: Simplify right side
    91,008.70x = 9,826,455,062.49
  5. Step 5: Solve for x
    x = 9,826,455,062.49/91,008.70
  6. Step 6: Final answer
    x = 107,972.70

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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.