Home / 129,144.54-178,221.16-78,156.66

Finding the Fourth Proportional to 129,144.54, 178,221.16 and 78,156.66

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Solution

The fourth proportional to 129,144.54, 178,221.16 and 78,156.66 is: 107,857.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,144.54 : 178,221.16 = 78,156.66 : x
  2. Step 2: Convert to fraction form
    129,144.54/178,221.16 = 78,156.66/x
  3. Step 3: Cross multiply
    129,144.54x = 178,221.16 × 78,156.66
  4. Step 4: Simplify right side
    129,144.54x = 13,929,170,606.93
  5. Step 5: Solve for x
    x = 13,929,170,606.93/129,144.54
  6. Step 6: Final answer
    x = 107,857.22

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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.