Home / 129,080.70-178,159.95-71,739.72

Finding the Fourth Proportional to 129,080.70, 178,159.95 and 71,739.72

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Solution

The fourth proportional to 129,080.70, 178,159.95 and 71,739.72 is: 99,016.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,080.70 : 178,159.95 = 71,739.72 : x
  2. Step 2: Convert to fraction form
    129,080.70/178,159.95 = 71,739.72/x
  3. Step 3: Cross multiply
    129,080.70x = 178,159.95 × 71,739.72
  4. Step 4: Simplify right side
    129,080.70x = 12,781,144,928.21
  5. Step 5: Solve for x
    x = 12,781,144,928.21/129,080.70
  6. Step 6: Final answer
    x = 99,016.70

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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.