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Finding the Fourth Proportional to 492.82, 680.10 and 318.47

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Solution

The fourth proportional to 492.82, 680.10 and 318.47 is: 439.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.82 : 680.10 = 318.47 : x
  2. Step 2: Convert to fraction form
    492.82/680.10 = 318.47/x
  3. Step 3: Cross multiply
    492.82x = 680.10 × 318.47
  4. Step 4: Simplify right side
    492.82x = 216,590.56
  5. Step 5: Solve for x
    x = 216,590.56/492.82
  6. Step 6: Final answer
    x = 439.49

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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.