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Finding the Fourth Proportional to 387.91, 535.26 and 247.97

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Solution

The fourth proportional to 387.91, 535.26 and 247.97 is: 342.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.91 : 535.26 = 247.97 : x
  2. Step 2: Convert to fraction form
    387.91/535.26 = 247.97/x
  3. Step 3: Cross multiply
    387.91x = 535.26 × 247.97
  4. Step 4: Simplify right side
    387.91x = 132,728.42
  5. Step 5: Solve for x
    x = 132,728.42/387.91
  6. Step 6: Final answer
    x = 342.16

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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.