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Finding the Fourth Proportional to 280.69, 387.29 and 170.17

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Solution

The fourth proportional to 280.69, 387.29 and 170.17 is: 234.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.69 : 387.29 = 170.17 : x
  2. Step 2: Convert to fraction form
    280.69/387.29 = 170.17/x
  3. Step 3: Cross multiply
    280.69x = 387.29 × 170.17
  4. Step 4: Simplify right side
    280.69x = 65,903.20
  5. Step 5: Solve for x
    x = 65,903.20/280.69
  6. Step 6: Final answer
    x = 234.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.