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Finding the Fourth Proportional to 281.95, 421.84 and 153.79

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Solution

The fourth proportional to 281.95, 421.84 and 153.79 is: 230.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.95 : 421.84 = 153.79 : x
  2. Step 2: Convert to fraction form
    281.95/421.84 = 153.79/x
  3. Step 3: Cross multiply
    281.95x = 421.84 × 153.79
  4. Step 4: Simplify right side
    281.95x = 64,874.77
  5. Step 5: Solve for x
    x = 64,874.77/281.95
  6. Step 6: Final answer
    x = 230.09

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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.