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Finding the Fourth Proportional to 128,763.64, 177,691.92 and 71,403.04

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Solution

The fourth proportional to 128,763.64, 177,691.92 and 71,403.04 is: 98,535.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,763.64 : 177,691.92 = 71,403.04 : x
  2. Step 2: Convert to fraction form
    128,763.64/177,691.92 = 71,403.04/x
  3. Step 3: Cross multiply
    128,763.64x = 177,691.92 × 71,403.04
  4. Step 4: Simplify right side
    128,763.64x = 12,687,743,271.44
  5. Step 5: Solve for x
    x = 12,687,743,271.44/128,763.64
  6. Step 6: Final answer
    x = 98,535.14

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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.