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Finding the Fourth Proportional to 281.67, 422.51 and 261.63

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Solution

The fourth proportional to 281.67, 422.51 and 261.63 is: 392.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.67 : 422.51 = 261.63 : x
  2. Step 2: Convert to fraction form
    281.67/422.51 = 261.63/x
  3. Step 3: Cross multiply
    281.67x = 422.51 × 261.63
  4. Step 4: Simplify right side
    281.67x = 110,539.98
  5. Step 5: Solve for x
    x = 110,539.98/281.67
  6. Step 6: Final answer
    x = 392.45

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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.