Home / 129,042.46-178,072.56-71,685.50

Finding the Fourth Proportional to 129,042.46, 178,072.56 and 71,685.50

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Solution

The fourth proportional to 129,042.46, 178,072.56 and 71,685.50 is: 98,922.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,042.46 : 178,072.56 = 71,685.50 : x
  2. Step 2: Convert to fraction form
    129,042.46/178,072.56 = 71,685.50/x
  3. Step 3: Cross multiply
    129,042.46x = 178,072.56 × 71,685.50
  4. Step 4: Simplify right side
    129,042.46x = 12,765,220,499.88
  5. Step 5: Solve for x
    x = 12,765,220,499.88/129,042.46
  6. Step 6: Final answer
    x = 98,922.64

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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.