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Finding the Fourth Proportional to 371.31, 512.08 and 288.15

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Solution

The fourth proportional to 371.31, 512.08 and 288.15 is: 397.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.31 : 512.08 = 288.15 : x
  2. Step 2: Convert to fraction form
    371.31/512.08 = 288.15/x
  3. Step 3: Cross multiply
    371.31x = 512.08 × 288.15
  4. Step 4: Simplify right side
    371.31x = 147,555.85
  5. Step 5: Solve for x
    x = 147,555.85/371.31
  6. Step 6: Final answer
    x = 397.39

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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.