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Finding the Fourth Proportional to 317.11, 437.79 and 243.20

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Solution

The fourth proportional to 317.11, 437.79 and 243.20 is: 335.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.11 : 437.79 = 243.20 : x
  2. Step 2: Convert to fraction form
    317.11/437.79 = 243.20/x
  3. Step 3: Cross multiply
    317.11x = 437.79 × 243.20
  4. Step 4: Simplify right side
    317.11x = 106,470.53
  5. Step 5: Solve for x
    x = 106,470.53/317.11
  6. Step 6: Final answer
    x = 335.75

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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.