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Finding the Fourth Proportional to 280.73, 421.14 and 118.40

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Solution

The fourth proportional to 280.73, 421.14 and 118.40 is: 177.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.73 : 421.14 = 118.40 : x
  2. Step 2: Convert to fraction form
    280.73/421.14 = 118.40/x
  3. Step 3: Cross multiply
    280.73x = 421.14 × 118.40
  4. Step 4: Simplify right side
    280.73x = 49,862.98
  5. Step 5: Solve for x
    x = 49,862.98/280.73
  6. Step 6: Final answer
    x = 177.62

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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.