Home / 129,696.85-178,951.17-78,708.43

Finding the Fourth Proportional to 129,696.85, 178,951.17 and 78,708.43

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Solution

The fourth proportional to 129,696.85, 178,951.17 and 78,708.43 is: 108,599.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,696.85 : 178,951.17 = 78,708.43 : x
  2. Step 2: Convert to fraction form
    129,696.85/178,951.17 = 78,708.43/x
  3. Step 3: Cross multiply
    129,696.85x = 178,951.17 × 78,708.43
  4. Step 4: Simplify right side
    129,696.85x = 14,084,966,659.51
  5. Step 5: Solve for x
    x = 14,084,966,659.51/129,696.85
  6. Step 6: Final answer
    x = 108,599.15

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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.