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Finding the Fourth Proportional to 280.89, 421.39 and 159.21

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Solution

The fourth proportional to 280.89, 421.39 and 159.21 is: 238.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.89 : 421.39 = 159.21 : x
  2. Step 2: Convert to fraction form
    280.89/421.39 = 159.21/x
  3. Step 3: Cross multiply
    280.89x = 421.39 × 159.21
  4. Step 4: Simplify right side
    280.89x = 67,090.39
  5. Step 5: Solve for x
    x = 67,090.39/280.89
  6. Step 6: Final answer
    x = 238.85

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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.