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Finding the Fourth Proportional to 280.95, 421.31 and 165.42

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Solution

The fourth proportional to 280.95, 421.31 and 165.42 is: 248.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.95 : 421.31 = 165.42 : x
  2. Step 2: Convert to fraction form
    280.95/421.31 = 165.42/x
  3. Step 3: Cross multiply
    280.95x = 421.31 × 165.42
  4. Step 4: Simplify right side
    280.95x = 69,693.10
  5. Step 5: Solve for x
    x = 69,693.10/280.95
  6. Step 6: Final answer
    x = 248.06

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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.