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Finding the Fourth Proportional to 80,407.80, 120,417.30 and 76,908.60

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Solution

The fourth proportional to 80,407.80, 120,417.30 and 76,908.60 is: 115,176.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,407.80 : 120,417.30 = 76,908.60 : x
  2. Step 2: Convert to fraction form
    80,407.80/120,417.30 = 76,908.60/x
  3. Step 3: Cross multiply
    80,407.80x = 120,417.30 × 76,908.60
  4. Step 4: Simplify right side
    80,407.80x = 9,261,125,958.78
  5. Step 5: Solve for x
    x = 9,261,125,958.78/80,407.80
  6. Step 6: Final answer
    x = 115,176.96

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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.