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Finding the Fourth Proportional to 280.98, 421.50 and 136.74

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Solution

The fourth proportional to 280.98, 421.50 and 136.74 is: 205.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.98 : 421.50 = 136.74 : x
  2. Step 2: Convert to fraction form
    280.98/421.50 = 136.74/x
  3. Step 3: Cross multiply
    280.98x = 421.50 × 136.74
  4. Step 4: Simplify right side
    280.98x = 57,635.91
  5. Step 5: Solve for x
    x = 57,635.91/280.98
  6. Step 6: Final answer
    x = 205.12

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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.