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Finding the Fourth Proportional to 100,418.67, 138,579.57 and 55,098.90

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Solution

The fourth proportional to 100,418.67, 138,579.57 and 55,098.90 is: 76,037.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,418.67 : 138,579.57 = 55,098.90 : x
  2. Step 2: Convert to fraction form
    100,418.67/138,579.57 = 55,098.90/x
  3. Step 3: Cross multiply
    100,418.67x = 138,579.57 × 55,098.90
  4. Step 4: Simplify right side
    100,418.67x = 7,635,581,869.47
  5. Step 5: Solve for x
    x = 7,635,581,869.47/100,418.67
  6. Step 6: Final answer
    x = 76,037.47

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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.