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Finding the Fourth Proportional to 91,245.40, 136,868.10 and 66,167.80

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Solution

The fourth proportional to 91,245.40, 136,868.10 and 66,167.80 is: 99,251.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,245.40 : 136,868.10 = 66,167.80 : x
  2. Step 2: Convert to fraction form
    91,245.40/136,868.10 = 66,167.80/x
  3. Step 3: Cross multiply
    91,245.40x = 136,868.10 × 66,167.80
  4. Step 4: Simplify right side
    91,245.40x = 9,056,261,067.18
  5. Step 5: Solve for x
    x = 9,056,261,067.18/91,245.40
  6. Step 6: Final answer
    x = 99,251.70

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1.5x scale

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.