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Finding the Fourth Proportional to 386, 532.80 and 230.78

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Solution

The fourth proportional to 386, 532.80 and 230.78 is: 318.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    386 : 532.80 = 230.78 : x
  2. Step 2: Convert to fraction form
    386/532.80 = 230.78/x
  3. Step 3: Cross multiply
    386x = 532.80 × 230.78
  4. Step 4: Simplify right side
    386x = 122,959.58
  5. Step 5: Solve for x
    x = 122,959.58/386
  6. Step 6: Final answer
    x = 318.55

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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.