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Finding the Fourth Proportional to 562.20, 843.90 and 319.20

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Solution

The fourth proportional to 562.20, 843.90 and 319.20 is: 479.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    562.20 : 843.90 = 319.20 : x
  2. Step 2: Convert to fraction form
    562.20/843.90 = 319.20/x
  3. Step 3: Cross multiply
    562.20x = 843.90 × 319.20
  4. Step 4: Simplify right side
    562.20x = 269,372.88
  5. Step 5: Solve for x
    x = 269,372.88/562.20
  6. Step 6: Final answer
    x = 479.14

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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.