Home / 129,115.20-178,190.15-75,417.51

Finding the Fourth Proportional to 129,115.20, 178,190.15 and 75,417.51

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Solution

The fourth proportional to 129,115.20, 178,190.15 and 75,417.51 is: 104,082.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,115.20 : 178,190.15 = 75,417.51 : x
  2. Step 2: Convert to fraction form
    129,115.20/178,190.15 = 75,417.51/x
  3. Step 3: Cross multiply
    129,115.20x = 178,190.15 × 75,417.51
  4. Step 4: Simplify right side
    129,115.20x = 13,438,657,042.44
  5. Step 5: Solve for x
    x = 13,438,657,042.44/129,115.20
  6. Step 6: Final answer
    x = 104,082.69

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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.