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Finding the Fourth Proportional to 280.64, 387.17 and 170.14

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Solution

The fourth proportional to 280.64, 387.17 and 170.14 is: 234.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.64 : 387.17 = 170.14 : x
  2. Step 2: Convert to fraction form
    280.64/387.17 = 170.14/x
  3. Step 3: Cross multiply
    280.64x = 387.17 × 170.14
  4. Step 4: Simplify right side
    280.64x = 65,871.87
  5. Step 5: Solve for x
    x = 65,871.87/280.64
  6. Step 6: Final answer
    x = 234.72

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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.