Home / 129,755.34-179,031.78-78,766.80

Finding the Fourth Proportional to 129,755.34, 179,031.78 and 78,766.80

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Solution

The fourth proportional to 129,755.34, 179,031.78 and 78,766.80 is: 108,679.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,755.34 : 179,031.78 = 78,766.80 : x
  2. Step 2: Convert to fraction form
    129,755.34/179,031.78 = 78,766.80/x
  3. Step 3: Cross multiply
    129,755.34x = 179,031.78 × 78,766.80
  4. Step 4: Simplify right side
    129,755.34x = 14,101,760,408.90
  5. Step 5: Solve for x
    x = 14,101,760,408.90/129,755.34
  6. Step 6: Final answer
    x = 108,679.62

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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.