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Finding the Fourth Proportional to 128,763.93, 177,694.62 and 71,407.29

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Solution

The fourth proportional to 128,763.93, 177,694.62 and 71,407.29 is: 98,542.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,763.93 : 177,694.62 = 71,407.29 : x
  2. Step 2: Convert to fraction form
    128,763.93/177,694.62 = 71,407.29/x
  3. Step 3: Cross multiply
    128,763.93x = 177,694.62 × 71,407.29
  4. Step 4: Simplify right side
    128,763.93x = 12,688,691,261.78
  5. Step 5: Solve for x
    x = 12,688,691,261.78/128,763.93
  6. Step 6: Final answer
    x = 98,542.28

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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.