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Finding the Fourth Proportional to 387.12, 534.24 and 255.90

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Solution

The fourth proportional to 387.12, 534.24 and 255.90 is: 353.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.12 : 534.24 = 255.90 : x
  2. Step 2: Convert to fraction form
    387.12/534.24 = 255.90/x
  3. Step 3: Cross multiply
    387.12x = 534.24 × 255.90
  4. Step 4: Simplify right side
    387.12x = 136,709.34
  5. Step 5: Solve for x
    x = 136,709.34/387.12
  6. Step 6: Final answer
    x = 353.15

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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.