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Finding the Fourth Proportional to 280.65, 418.49 and 271.74

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Solution

The fourth proportional to 280.65, 418.49 and 271.74 is: 405.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.65 : 418.49 = 271.74 : x
  2. Step 2: Convert to fraction form
    280.65/418.49 = 271.74/x
  3. Step 3: Cross multiply
    280.65x = 418.49 × 271.74
  4. Step 4: Simplify right side
    280.65x = 113,720.47
  5. Step 5: Solve for x
    x = 113,720.47/280.65
  6. Step 6: Final answer
    x = 405.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.