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Finding the Fourth Proportional to 281.01, 421.56 and 172.92

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Solution

The fourth proportional to 281.01, 421.56 and 172.92 is: 259.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.01 : 421.56 = 172.92 : x
  2. Step 2: Convert to fraction form
    281.01/421.56 = 172.92/x
  3. Step 3: Cross multiply
    281.01x = 421.56 × 172.92
  4. Step 4: Simplify right side
    281.01x = 72,896.16
  5. Step 5: Solve for x
    x = 72,896.16/281.01
  6. Step 6: Final answer
    x = 259.41

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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.