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Finding the Fourth Proportional to 671.20, 927.20 and 517.92

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Solution

The fourth proportional to 671.20, 927.20 and 517.92 is: 715.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.20 : 927.20 = 517.92 : x
  2. Step 2: Convert to fraction form
    671.20/927.20 = 517.92/x
  3. Step 3: Cross multiply
    671.20x = 927.20 × 517.92
  4. Step 4: Simplify right side
    671.20x = 480,215.42
  5. Step 5: Solve for x
    x = 480,215.42/671.20
  6. Step 6: Final answer
    x = 715.46

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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.