Home / 129,115.78-178,168.89-78,805.06

Finding the Fourth Proportional to 129,115.78, 178,168.89 and 78,805.06

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Solution

The fourth proportional to 129,115.78, 178,168.89 and 78,805.06 is: 108,744.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,115.78 : 178,168.89 = 78,805.06 : x
  2. Step 2: Convert to fraction form
    129,115.78/178,168.89 = 78,805.06/x
  3. Step 3: Cross multiply
    129,115.78x = 178,168.89 × 78,805.06
  4. Step 4: Simplify right side
    129,115.78x = 14,040,610,066.58
  5. Step 5: Solve for x
    x = 14,040,610,066.58/129,115.78
  6. Step 6: Final answer
    x = 108,744.34

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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.