Home / 129,281.82-178,321.20-83,878.70

Finding the Fourth Proportional to 129,281.82, 178,321.20 and 83,878.70

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Solution

The fourth proportional to 129,281.82, 178,321.20 and 83,878.70 is: 115,695.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,281.82 : 178,321.20 = 83,878.70 : x
  2. Step 2: Convert to fraction form
    129,281.82/178,321.20 = 83,878.70/x
  3. Step 3: Cross multiply
    129,281.82x = 178,321.20 × 83,878.70
  4. Step 4: Simplify right side
    129,281.82x = 14,957,349,546.83
  5. Step 5: Solve for x
    x = 14,957,349,546.83/129,281.82
  6. Step 6: Final answer
    x = 115,695.69

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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.