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Finding the Fourth Proportional to 281.46, 421.91 and 189.93

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Solution

The fourth proportional to 281.46, 421.91 and 189.93 is: 284.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.46 : 421.91 = 189.93 : x
  2. Step 2: Convert to fraction form
    281.46/421.91 = 189.93/x
  3. Step 3: Cross multiply
    281.46x = 421.91 × 189.93
  4. Step 4: Simplify right side
    281.46x = 80,132.42
  5. Step 5: Solve for x
    x = 80,132.42/281.46
  6. Step 6: Final answer
    x = 284.70

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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.