Home / 128,780.50-177,717.61-71,425.18

Finding the Fourth Proportional to 128,780.50, 177,717.61 and 71,425.18

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Solution

The fourth proportional to 128,780.50, 177,717.61 and 71,425.18 is: 98,567.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,780.50 : 177,717.61 = 71,425.18 : x
  2. Step 2: Convert to fraction form
    128,780.50/177,717.61 = 71,425.18/x
  3. Step 3: Cross multiply
    128,780.50x = 177,717.61 × 71,425.18
  4. Step 4: Simplify right side
    128,780.50x = 12,693,511,595.19
  5. Step 5: Solve for x
    x = 12,693,511,595.19/128,780.50
  6. Step 6: Final answer
    x = 98,567.03

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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.