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Finding the Fourth Proportional to 128,512.81, 177,326.52 and 80,732.32

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Solution

The fourth proportional to 128,512.81, 177,326.52 and 80,732.32 is: 111,397.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,512.81 : 177,326.52 = 80,732.32 : x
  2. Step 2: Convert to fraction form
    128,512.81/177,326.52 = 80,732.32/x
  3. Step 3: Cross multiply
    128,512.81x = 177,326.52 × 80,732.32
  4. Step 4: Simplify right side
    128,512.81x = 14,315,981,357.13
  5. Step 5: Solve for x
    x = 14,315,981,357.13/128,512.81
  6. Step 6: Final answer
    x = 111,397.31

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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.