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Finding the Fourth Proportional to 655.75, 987.28 and 579.16

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Solution

The fourth proportional to 655.75, 987.28 and 579.16 is: 871.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.75 : 987.28 = 579.16 : x
  2. Step 2: Convert to fraction form
    655.75/987.28 = 579.16/x
  3. Step 3: Cross multiply
    655.75x = 987.28 × 579.16
  4. Step 4: Simplify right side
    655.75x = 571,793.08
  5. Step 5: Solve for x
    x = 571,793.08/655.75
  6. Step 6: Final answer
    x = 871.97

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.