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Finding the Fourth Proportional to 128,676, 177,579.96 and 71,314.13

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Solution

The fourth proportional to 128,676, 177,579.96 and 71,314.13 is: 98,417.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,676 : 177,579.96 = 71,314.13 : x
  2. Step 2: Convert to fraction form
    128,676/177,579.96 = 71,314.13/x
  3. Step 3: Cross multiply
    128,676x = 177,579.96 × 71,314.13
  4. Step 4: Simplify right side
    128,676x = 12,663,960,352.83
  5. Step 5: Solve for x
    x = 12,663,960,352.83/128,676
  6. Step 6: Final answer
    x = 98,417.42

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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.