Home / 129,621.60-178,825.20-79,349.76

Finding the Fourth Proportional to 129,621.60, 178,825.20 and 79,349.76

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Solution

The fourth proportional to 129,621.60, 178,825.20 and 79,349.76 is: 109,470.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,621.60 : 178,825.20 = 79,349.76 : x
  2. Step 2: Convert to fraction form
    129,621.60/178,825.20 = 79,349.76/x
  3. Step 3: Cross multiply
    129,621.60x = 178,825.20 × 79,349.76
  4. Step 4: Simplify right side
    129,621.60x = 14,189,736,701.95
  5. Step 5: Solve for x
    x = 14,189,736,701.95/129,621.60
  6. Step 6: Final answer
    x = 109,470.46

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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.