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Finding the Fourth Proportional to 84,319.70, 126,479.55 and 80,431.70

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Solution

The fourth proportional to 84,319.70, 126,479.55 and 80,431.70 is: 120,647.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,319.70 : 126,479.55 = 80,431.70 : x
  2. Step 2: Convert to fraction form
    84,319.70/126,479.55 = 80,431.70/x
  3. Step 3: Cross multiply
    84,319.70x = 126,479.55 × 80,431.70
  4. Step 4: Simplify right side
    84,319.70x = 10,172,965,221.74
  5. Step 5: Solve for x
    x = 10,172,965,221.74/84,319.70
  6. Step 6: Final answer
    x = 120,647.55

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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.