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Finding the Fourth Proportional to 387.92, 535.07 and 247.86

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Solution

The fourth proportional to 387.92, 535.07 and 247.86 is: 341.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.92 : 535.07 = 247.86 : x
  2. Step 2: Convert to fraction form
    387.92/535.07 = 247.86/x
  3. Step 3: Cross multiply
    387.92x = 535.07 × 247.86
  4. Step 4: Simplify right side
    387.92x = 132,623.07
  5. Step 5: Solve for x
    x = 132,623.07/387.92
  6. Step 6: Final answer
    x = 341.88

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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.