Home / 80,121.12-120,254.28-42,712.56

Finding the Fourth Proportional to 80,121.12, 120,254.28 and 42,712.56

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Solution

The fourth proportional to 80,121.12, 120,254.28 and 42,712.56 is: 64,107.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,121.12 : 120,254.28 = 42,712.56 : x
  2. Step 2: Convert to fraction form
    80,121.12/120,254.28 = 42,712.56/x
  3. Step 3: Cross multiply
    80,121.12x = 120,254.28 × 42,712.56
  4. Step 4: Simplify right side
    80,121.12x = 5,136,368,149.76
  5. Step 5: Solve for x
    x = 5,136,368,149.76/80,121.12
  6. Step 6: Final answer
    x = 64,107.54

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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.