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Finding the Fourth Proportional to 398.72, 549.92 and 258.87

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Solution

The fourth proportional to 398.72, 549.92 and 258.87 is: 357.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.72 : 549.92 = 258.87 : x
  2. Step 2: Convert to fraction form
    398.72/549.92 = 258.87/x
  3. Step 3: Cross multiply
    398.72x = 549.92 × 258.87
  4. Step 4: Simplify right side
    398.72x = 142,356.38
  5. Step 5: Solve for x
    x = 142,356.38/398.72
  6. Step 6: Final answer
    x = 357.04

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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.