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Finding the Fourth Proportional to 128,379.39, 177,160.25 and 71,017.22

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Solution

The fourth proportional to 128,379.39, 177,160.25 and 71,017.22 is: 98,001.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,379.39 : 177,160.25 = 71,017.22 : x
  2. Step 2: Convert to fraction form
    128,379.39/177,160.25 = 71,017.22/x
  3. Step 3: Cross multiply
    128,379.39x = 177,160.25 × 71,017.22
  4. Step 4: Simplify right side
    128,379.39x = 12,581,427,208.62
  5. Step 5: Solve for x
    x = 12,581,427,208.62/128,379.39
  6. Step 6: Final answer
    x = 98,001.92

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1.5x scale

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.