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Finding the Fourth Proportional to 100,089.12, 150,133.92 and 81,279.84

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Solution

The fourth proportional to 100,089.12, 150,133.92 and 81,279.84 is: 121,919.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,089.12 : 150,133.92 = 81,279.84 : x
  2. Step 2: Convert to fraction form
    100,089.12/150,133.92 = 81,279.84/x
  3. Step 3: Cross multiply
    100,089.12x = 150,133.92 × 81,279.84
  4. Step 4: Simplify right side
    100,089.12x = 12,202,860,996.17
  5. Step 5: Solve for x
    x = 12,202,860,996.17/100,089.12
  6. Step 6: Final answer
    x = 121,919.95

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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.