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Finding the Fourth Proportional to 398.09, 549.19 and 281.81

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Solution

The fourth proportional to 398.09, 549.19 and 281.81 is: 388.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.09 : 549.19 = 281.81 : x
  2. Step 2: Convert to fraction form
    398.09/549.19 = 281.81/x
  3. Step 3: Cross multiply
    398.09x = 549.19 × 281.81
  4. Step 4: Simplify right side
    398.09x = 154,767.23
  5. Step 5: Solve for x
    x = 154,767.23/398.09
  6. Step 6: Final answer
    x = 388.77

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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.