Home / 129,360.25-178,517.10-72,771.64

Finding the Fourth Proportional to 129,360.25, 178,517.10 and 72,771.64

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Solution

The fourth proportional to 129,360.25, 178,517.10 and 72,771.64 is: 100,424.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,360.25 : 178,517.10 = 72,771.64 : x
  2. Step 2: Convert to fraction form
    129,360.25/178,517.10 = 72,771.64/x
  3. Step 3: Cross multiply
    129,360.25x = 178,517.10 × 72,771.64
  4. Step 4: Simplify right side
    129,360.25x = 12,990,982,135.04
  5. Step 5: Solve for x
    x = 12,990,982,135.04/129,360.25
  6. Step 6: Final answer
    x = 100,424.84

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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.