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Finding the Fourth Proportional to 80,710.80, 120,778.20 and 51,142.80

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Solution

The fourth proportional to 80,710.80, 120,778.20 and 51,142.80 is: 76,531.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,710.80 : 120,778.20 = 51,142.80 : x
  2. Step 2: Convert to fraction form
    80,710.80/120,778.20 = 51,142.80/x
  3. Step 3: Cross multiply
    80,710.80x = 120,778.20 × 51,142.80
  4. Step 4: Simplify right side
    80,710.80x = 6,176,935,326.96
  5. Step 5: Solve for x
    x = 6,176,935,326.96/80,710.80
  6. Step 6: Final answer
    x = 76,531.71

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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.