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Finding the Fourth Proportional to 280.75, 421.14 and 88.39

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Solution

The fourth proportional to 280.75, 421.14 and 88.39 is: 132.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.75 : 421.14 = 88.39 : x
  2. Step 2: Convert to fraction form
    280.75/421.14 = 88.39/x
  3. Step 3: Cross multiply
    280.75x = 421.14 × 88.39
  4. Step 4: Simplify right side
    280.75x = 37,224.56
  5. Step 5: Solve for x
    x = 37,224.56/280.75
  6. Step 6: Final answer
    x = 132.59

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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.