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Finding the Fourth Proportional to 128,480.43, 177,354 and 87,096.92

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Solution

The fourth proportional to 128,480.43, 177,354 and 87,096.92 is: 120,228.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,480.43 : 177,354 = 87,096.92 : x
  2. Step 2: Convert to fraction form
    128,480.43/177,354 = 87,096.92/x
  3. Step 3: Cross multiply
    128,480.43x = 177,354 × 87,096.92
  4. Step 4: Simplify right side
    128,480.43x = 15,446,986,262.91
  5. Step 5: Solve for x
    x = 15,446,986,262.91/128,480.43
  6. Step 6: Final answer
    x = 120,228.32

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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.