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Finding the Fourth Proportional to 128,555.92, 177,397.32 and 71,959.60

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Solution

The fourth proportional to 128,555.92, 177,397.32 and 71,959.60 is: 99,298.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,555.92 : 177,397.32 = 71,959.60 : x
  2. Step 2: Convert to fraction form
    128,555.92/177,397.32 = 71,959.60/x
  3. Step 3: Cross multiply
    128,555.92x = 177,397.32 × 71,959.60
  4. Step 4: Simplify right side
    128,555.92x = 12,765,440,188.27
  5. Step 5: Solve for x
    x = 12,765,440,188.27/128,555.92
  6. Step 6: Final answer
    x = 99,298.73

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1.5x scale

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.