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Finding the Fourth Proportional to 280.89, 421.35 and 98.52

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Solution

The fourth proportional to 280.89, 421.35 and 98.52 is: 147.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.89 : 421.35 = 98.52 : x
  2. Step 2: Convert to fraction form
    280.89/421.35 = 98.52/x
  3. Step 3: Cross multiply
    280.89x = 421.35 × 98.52
  4. Step 4: Simplify right side
    280.89x = 41,511.40
  5. Step 5: Solve for x
    x = 41,511.40/280.89
  6. Step 6: Final answer
    x = 147.79

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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.