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Finding the Fourth Proportional to 318.92, 439.86 and 263.48

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Solution

The fourth proportional to 318.92, 439.86 and 263.48 is: 363.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.92 : 439.86 = 263.48 : x
  2. Step 2: Convert to fraction form
    318.92/439.86 = 263.48/x
  3. Step 3: Cross multiply
    318.92x = 439.86 × 263.48
  4. Step 4: Simplify right side
    318.92x = 115,894.31
  5. Step 5: Solve for x
    x = 115,894.31/318.92
  6. Step 6: Final answer
    x = 363.40

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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.