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Finding the Fourth Proportional to 386.17, 532.85 and 255.11

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Solution

The fourth proportional to 386.17, 532.85 and 255.11 is: 352.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.17 : 532.85 = 255.11 : x
  2. Step 2: Convert to fraction form
    386.17/532.85 = 255.11/x
  3. Step 3: Cross multiply
    386.17x = 532.85 × 255.11
  4. Step 4: Simplify right side
    386.17x = 135,931.42
  5. Step 5: Solve for x
    x = 135,931.42/386.17
  6. Step 6: Final answer
    x = 352.00

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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.