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Finding the Fourth Proportional to 386.28, 532.51 and 238.66

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Solution

The fourth proportional to 386.28, 532.51 and 238.66 is: 329.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.28 : 532.51 = 238.66 : x
  2. Step 2: Convert to fraction form
    386.28/532.51 = 238.66/x
  3. Step 3: Cross multiply
    386.28x = 532.51 × 238.66
  4. Step 4: Simplify right side
    386.28x = 127,086.91
  5. Step 5: Solve for x
    x = 127,086.91/386.28
  6. Step 6: Final answer
    x = 329.00

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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.