Home / 128,972.42-177,979.44-71,608.79

Finding the Fourth Proportional to 128,972.42, 177,979.44 and 71,608.79

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Solution

The fourth proportional to 128,972.42, 177,979.44 and 71,608.79 is: 98,818.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,972.42 : 177,979.44 = 71,608.79 : x
  2. Step 2: Convert to fraction form
    128,972.42/177,979.44 = 71,608.79/x
  3. Step 3: Cross multiply
    128,972.42x = 177,979.44 × 71,608.79
  4. Step 4: Simplify right side
    128,972.42x = 12,744,891,453.38
  5. Step 5: Solve for x
    x = 12,744,891,453.38/128,972.42
  6. Step 6: Final answer
    x = 98,818.74

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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.