Home / 129,147.90-178,211.88-71,780.42

Finding the Fourth Proportional to 129,147.90, 178,211.88 and 71,780.42

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Solution

The fourth proportional to 129,147.90, 178,211.88 and 71,780.42 is: 99,050.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,147.90 : 178,211.88 = 71,780.42 : x
  2. Step 2: Convert to fraction form
    129,147.90/178,211.88 = 71,780.42/x
  3. Step 3: Cross multiply
    129,147.90x = 178,211.88 × 71,780.42
  4. Step 4: Simplify right side
    129,147.90x = 12,792,122,863.57
  5. Step 5: Solve for x
    x = 12,792,122,863.57/129,147.90
  6. Step 6: Final answer
    x = 99,050.18

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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.