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Finding the Fourth Proportional to 281.52, 388.53 and 216.18

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Solution

The fourth proportional to 281.52, 388.53 and 216.18 is: 298.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.52 : 388.53 = 216.18 : x
  2. Step 2: Convert to fraction form
    281.52/388.53 = 216.18/x
  3. Step 3: Cross multiply
    281.52x = 388.53 × 216.18
  4. Step 4: Simplify right side
    281.52x = 83,992.42
  5. Step 5: Solve for x
    x = 83,992.42/281.52
  6. Step 6: Final answer
    x = 298.35

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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.