Home / 129,114.80-178,155.96-72,528.56

Finding the Fourth Proportional to 129,114.80, 178,155.96 and 72,528.56

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Solution

The fourth proportional to 129,114.80, 178,155.96 and 72,528.56 is: 100,076.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,114.80 : 178,155.96 = 72,528.56 : x
  2. Step 2: Convert to fraction form
    129,114.80/178,155.96 = 72,528.56/x
  3. Step 3: Cross multiply
    129,114.80x = 178,155.96 × 72,528.56
  4. Step 4: Simplify right side
    129,114.80x = 12,921,395,234.22
  5. Step 5: Solve for x
    x = 12,921,395,234.22/129,114.80
  6. Step 6: Final answer
    x = 100,076.79

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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.