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Finding the Fourth Proportional to 90,740.80, 135,965.40 and 75,869.20

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Solution

The fourth proportional to 90,740.80, 135,965.40 and 75,869.20 is: 113,681.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,740.80 : 135,965.40 = 75,869.20 : x
  2. Step 2: Convert to fraction form
    90,740.80/135,965.40 = 75,869.20/x
  3. Step 3: Cross multiply
    90,740.80x = 135,965.40 × 75,869.20
  4. Step 4: Simplify right side
    90,740.80x = 10,315,586,125.68
  5. Step 5: Solve for x
    x = 10,315,586,125.68/90,740.80
  6. Step 6: Final answer
    x = 113,681.90

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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.