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Finding the Fourth Proportional to 281.45, 421.72 and 171.64

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Solution

The fourth proportional to 281.45, 421.72 and 171.64 is: 257.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.45 : 421.72 = 171.64 : x
  2. Step 2: Convert to fraction form
    281.45/421.72 = 171.64/x
  3. Step 3: Cross multiply
    281.45x = 421.72 × 171.64
  4. Step 4: Simplify right side
    281.45x = 72,384.02
  5. Step 5: Solve for x
    x = 72,384.02/281.45
  6. Step 6: Final answer
    x = 257.18

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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.