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Finding the Fourth Proportional to 90,141.80, 135,212.70 and 40,221.80

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Solution

The fourth proportional to 90,141.80, 135,212.70 and 40,221.80 is: 60,332.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,141.80 : 135,212.70 = 40,221.80 : x
  2. Step 2: Convert to fraction form
    90,141.80/135,212.70 = 40,221.80/x
  3. Step 3: Cross multiply
    90,141.80x = 135,212.70 × 40,221.80
  4. Step 4: Simplify right side
    90,141.80x = 5,438,498,176.86
  5. Step 5: Solve for x
    x = 5,438,498,176.86/90,141.80
  6. Step 6: Final answer
    x = 60,332.70

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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.