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Finding the Fourth Proportional to 280.97, 421.34 and 143.87

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Solution

The fourth proportional to 280.97, 421.34 and 143.87 is: 215.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.97 : 421.34 = 143.87 : x
  2. Step 2: Convert to fraction form
    280.97/421.34 = 143.87/x
  3. Step 3: Cross multiply
    280.97x = 421.34 × 143.87
  4. Step 4: Simplify right side
    280.97x = 60,618.19
  5. Step 5: Solve for x
    x = 60,618.19/280.97
  6. Step 6: Final answer
    x = 215.75

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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.