Home / 80,789.10-121,239-28,198.58

Finding the Fourth Proportional to 80,789.10, 121,239 and 28,198.58

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Solution

The fourth proportional to 80,789.10, 121,239 and 28,198.58 is: 42,317.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,789.10 : 121,239 = 28,198.58 : x
  2. Step 2: Convert to fraction form
    80,789.10/121,239 = 28,198.58/x
  3. Step 3: Cross multiply
    80,789.10x = 121,239 × 28,198.58
  4. Step 4: Simplify right side
    80,789.10x = 3,418,767,640.62
  5. Step 5: Solve for x
    x = 3,418,767,640.62/80,789.10
  6. Step 6: Final answer
    x = 42,317.19

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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.