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Finding the Fourth Proportional to 318.97, 439.86 and 297.13

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Solution

The fourth proportional to 318.97, 439.86 and 297.13 is: 409.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.97 : 439.86 = 297.13 : x
  2. Step 2: Convert to fraction form
    318.97/439.86 = 297.13/x
  3. Step 3: Cross multiply
    318.97x = 439.86 × 297.13
  4. Step 4: Simplify right side
    318.97x = 130,695.60
  5. Step 5: Solve for x
    x = 130,695.60/318.97
  6. Step 6: Final answer
    x = 409.74

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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.