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Finding the Fourth Proportional to 129,443, 178,635.66 and 79,132.28

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Solution

The fourth proportional to 129,443, 178,635.66 and 79,132.28 is: 109,205.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,443 : 178,635.66 = 79,132.28 : x
  2. Step 2: Convert to fraction form
    129,443/178,635.66 = 79,132.28/x
  3. Step 3: Cross multiply
    129,443x = 178,635.66 × 79,132.28
  4. Step 4: Simplify right side
    129,443x = 14,135,847,065.10
  5. Step 5: Solve for x
    x = 14,135,847,065.10/129,443
  6. Step 6: Final answer
    x = 109,205.19

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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.