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Finding the Fourth Proportional to 280.82, 421.20 and 98.19

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Solution

The fourth proportional to 280.82, 421.20 and 98.19 is: 147.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.82 : 421.20 = 98.19 : x
  2. Step 2: Convert to fraction form
    280.82/421.20 = 98.19/x
  3. Step 3: Cross multiply
    280.82x = 421.20 × 98.19
  4. Step 4: Simplify right side
    280.82x = 41,357.63
  5. Step 5: Solve for x
    x = 41,357.63/280.82
  6. Step 6: Final answer
    x = 147.28

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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.