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Finding the Fourth Proportional to 1,057.92, 1,587.36 and 480.96

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Solution

The fourth proportional to 1,057.92, 1,587.36 and 480.96 is: 721.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.92 : 1,587.36 = 480.96 : x
  2. Step 2: Convert to fraction form
    1,057.92/1,587.36 = 480.96/x
  3. Step 3: Cross multiply
    1,057.92x = 1,587.36 × 480.96
  4. Step 4: Simplify right side
    1,057.92x = 763,456.67
  5. Step 5: Solve for x
    x = 763,456.67/1,057.92
  6. Step 6: Final answer
    x = 721.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.