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Finding the Fourth Proportional to 128,517.76, 177,354.73 and 71,929.14

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Solution

The fourth proportional to 128,517.76, 177,354.73 and 71,929.14 is: 99,262.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,517.76 : 177,354.73 = 71,929.14 : x
  2. Step 2: Convert to fraction form
    128,517.76/177,354.73 = 71,929.14/x
  3. Step 3: Cross multiply
    128,517.76x = 177,354.73 × 71,929.14
  4. Step 4: Simplify right side
    128,517.76x = 12,756,973,203.83
  5. Step 5: Solve for x
    x = 12,756,973,203.83/128,517.76
  6. Step 6: Final answer
    x = 99,262.34

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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.