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Finding the Fourth Proportional to 128,517.68, 177,338.64 and 71,152.64

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Solution

The fourth proportional to 128,517.68, 177,338.64 and 71,152.64 is: 98,181.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,517.68 : 177,338.64 = 71,152.64 : x
  2. Step 2: Convert to fraction form
    128,517.68/177,338.64 = 71,152.64/x
  3. Step 3: Cross multiply
    128,517.68x = 177,338.64 × 71,152.64
  4. Step 4: Simplify right side
    128,517.68x = 12,618,112,410.01
  5. Step 5: Solve for x
    x = 12,618,112,410.01/128,517.68
  6. Step 6: Final answer
    x = 98,181.92

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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.