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Finding the Fourth Proportional to 386.31, 532.31 and 385.59

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Solution

The fourth proportional to 386.31, 532.31 and 385.59 is: 531.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.31 : 532.31 = 385.59 : x
  2. Step 2: Convert to fraction form
    386.31/532.31 = 385.59/x
  3. Step 3: Cross multiply
    386.31x = 532.31 × 385.59
  4. Step 4: Simplify right side
    386.31x = 205,251.48
  5. Step 5: Solve for x
    x = 205,251.48/386.31
  6. Step 6: Final answer
    x = 531.31

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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.