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Finding the Fourth Proportional to 128,862.54, 177,829.92 and 72,275.13

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Solution

The fourth proportional to 128,862.54, 177,829.92 and 72,275.13 is: 99,739.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,862.54 : 177,829.92 = 72,275.13 : x
  2. Step 2: Convert to fraction form
    128,862.54/177,829.92 = 72,275.13/x
  3. Step 3: Cross multiply
    128,862.54x = 177,829.92 × 72,275.13
  4. Step 4: Simplify right side
    128,862.54x = 12,852,680,585.89
  5. Step 5: Solve for x
    x = 12,852,680,585.89/128,862.54
  6. Step 6: Final answer
    x = 99,739.46

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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.