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Finding the Fourth Proportional to 256.71, 385.20 and 170.13

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Solution

The fourth proportional to 256.71, 385.20 and 170.13 is: 255.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.71 : 385.20 = 170.13 : x
  2. Step 2: Convert to fraction form
    256.71/385.20 = 170.13/x
  3. Step 3: Cross multiply
    256.71x = 385.20 × 170.13
  4. Step 4: Simplify right side
    256.71x = 65,534.08
  5. Step 5: Solve for x
    x = 65,534.08/256.71
  6. Step 6: Final answer
    x = 255.28

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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.