Home / 129,311.78-178,449.08-72,723.56

Finding the Fourth Proportional to 129,311.78, 178,449.08 and 72,723.56

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Solution

The fourth proportional to 129,311.78, 178,449.08 and 72,723.56 is: 100,357.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,311.78 : 178,449.08 = 72,723.56 : x
  2. Step 2: Convert to fraction form
    129,311.78/178,449.08 = 72,723.56/x
  3. Step 3: Cross multiply
    129,311.78x = 178,449.08 × 72,723.56
  4. Step 4: Simplify right side
    129,311.78x = 12,977,452,376.32
  5. Step 5: Solve for x
    x = 12,977,452,376.32/129,311.78
  6. Step 6: Final answer
    x = 100,357.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.