Home / 100,146.20-138,189.49-79,780.14

Finding the Fourth Proportional to 100,146.20, 138,189.49 and 79,780.14

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Solution

The fourth proportional to 100,146.20, 138,189.49 and 79,780.14 is: 110,086.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,146.20 : 138,189.49 = 79,780.14 : x
  2. Step 2: Convert to fraction form
    100,146.20/138,189.49 = 79,780.14/x
  3. Step 3: Cross multiply
    100,146.20x = 138,189.49 × 79,780.14
  4. Step 4: Simplify right side
    100,146.20x = 11,024,777,108.04
  5. Step 5: Solve for x
    x = 11,024,777,108.04/100,146.20
  6. Step 6: Final answer
    x = 110,086.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.