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Finding the Fourth Proportional to 398.60, 549.90 and 281.96

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Solution

The fourth proportional to 398.60, 549.90 and 281.96 is: 388.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.60 : 549.90 = 281.96 : x
  2. Step 2: Convert to fraction form
    398.60/549.90 = 281.96/x
  3. Step 3: Cross multiply
    398.60x = 549.90 × 281.96
  4. Step 4: Simplify right side
    398.60x = 155,047.05
  5. Step 5: Solve for x
    x = 155,047.05/398.60
  6. Step 6: Final answer
    x = 388.98

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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.