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Finding the Fourth Proportional to 281.53, 422.30 and 99.13

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Solution

The fourth proportional to 281.53, 422.30 and 99.13 is: 148.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.53 : 422.30 = 99.13 : x
  2. Step 2: Convert to fraction form
    281.53/422.30 = 99.13/x
  3. Step 3: Cross multiply
    281.53x = 422.30 × 99.13
  4. Step 4: Simplify right side
    281.53x = 41,862.60
  5. Step 5: Solve for x
    x = 41,862.60/281.53
  6. Step 6: Final answer
    x = 148.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.