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Finding the Fourth Proportional to 387.31, 534.29 and 256.27

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Solution

The fourth proportional to 387.31, 534.29 and 256.27 is: 353.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.31 : 534.29 = 256.27 : x
  2. Step 2: Convert to fraction form
    387.31/534.29 = 256.27/x
  3. Step 3: Cross multiply
    387.31x = 534.29 × 256.27
  4. Step 4: Simplify right side
    387.31x = 136,921.22
  5. Step 5: Solve for x
    x = 136,921.22/387.31
  6. Step 6: Final answer
    x = 353.52

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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.