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Finding the Fourth Proportional to 90,712.80, 135,923.40 and 67,093.20

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Solution

The fourth proportional to 90,712.80, 135,923.40 and 67,093.20 is: 100,531.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,712.80 : 135,923.40 = 67,093.20 : x
  2. Step 2: Convert to fraction form
    90,712.80/135,923.40 = 67,093.20/x
  3. Step 3: Cross multiply
    90,712.80x = 135,923.40 × 67,093.20
  4. Step 4: Simplify right side
    90,712.80x = 9,119,535,860.88
  5. Step 5: Solve for x
    x = 9,119,535,860.88/90,712.80
  6. Step 6: Final answer
    x = 100,531.96

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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.