Home / 129,134.30-178,219.78-78,175.13

Finding the Fourth Proportional to 129,134.30, 178,219.78 and 78,175.13

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Solution

The fourth proportional to 129,134.30, 178,219.78 and 78,175.13 is: 107,890.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,134.30 : 178,219.78 = 78,175.13 : x
  2. Step 2: Convert to fraction form
    129,134.30/178,219.78 = 78,175.13/x
  3. Step 3: Cross multiply
    129,134.30x = 178,219.78 × 78,175.13
  4. Step 4: Simplify right side
    129,134.30x = 13,932,353,383.53
  5. Step 5: Solve for x
    x = 13,932,353,383.53/129,134.30
  6. Step 6: Final answer
    x = 107,890.42

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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.