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Finding the Fourth Proportional to 91,269.40, 136,904.10 and 66,191.80

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Solution

The fourth proportional to 91,269.40, 136,904.10 and 66,191.80 is: 99,287.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,269.40 : 136,904.10 = 66,191.80 : x
  2. Step 2: Convert to fraction form
    91,269.40/136,904.10 = 66,191.80/x
  3. Step 3: Cross multiply
    91,269.40x = 136,904.10 × 66,191.80
  4. Step 4: Simplify right side
    91,269.40x = 9,061,928,806.38
  5. Step 5: Solve for x
    x = 9,061,928,806.38/91,269.40
  6. Step 6: Final answer
    x = 99,287.70

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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.