Home / 80,115.56-120,714.18-66,381.20

Finding the Fourth Proportional to 80,115.56, 120,714.18 and 66,381.20

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Solution

The fourth proportional to 80,115.56, 120,714.18 and 66,381.20 is: 100,019.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,115.56 : 120,714.18 = 66,381.20 : x
  2. Step 2: Convert to fraction form
    80,115.56/120,714.18 = 66,381.20/x
  3. Step 3: Cross multiply
    80,115.56x = 120,714.18 × 66,381.20
  4. Step 4: Simplify right side
    80,115.56x = 8,013,152,125.42
  5. Step 5: Solve for x
    x = 8,013,152,125.42/80,115.56
  6. Step 6: Final answer
    x = 100,019.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.