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Finding the Fourth Proportional to 280.98, 421.47 and 136.72

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Solution

The fourth proportional to 280.98, 421.47 and 136.72 is: 205.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.98 : 421.47 = 136.72 : x
  2. Step 2: Convert to fraction form
    280.98/421.47 = 136.72/x
  3. Step 3: Cross multiply
    280.98x = 421.47 × 136.72
  4. Step 4: Simplify right side
    280.98x = 57,623.38
  5. Step 5: Solve for x
    x = 57,623.38/280.98
  6. Step 6: Final answer
    x = 205.08

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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.