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Finding the Fourth Proportional to 281.19, 421.72 and 172.92

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Solution

The fourth proportional to 281.19, 421.72 and 172.92 is: 259.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.19 : 421.72 = 172.92 : x
  2. Step 2: Convert to fraction form
    281.19/421.72 = 172.92/x
  3. Step 3: Cross multiply
    281.19x = 421.72 × 172.92
  4. Step 4: Simplify right side
    281.19x = 72,923.82
  5. Step 5: Solve for x
    x = 72,923.82/281.19
  6. Step 6: Final answer
    x = 259.34

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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.