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Finding the Fourth Proportional to 243.24, 335.08 and 208.16

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Solution

The fourth proportional to 243.24, 335.08 and 208.16 is: 286.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.24 : 335.08 = 208.16 : x
  2. Step 2: Convert to fraction form
    243.24/335.08 = 208.16/x
  3. Step 3: Cross multiply
    243.24x = 335.08 × 208.16
  4. Step 4: Simplify right side
    243.24x = 69,750.25
  5. Step 5: Solve for x
    x = 69,750.25/243.24
  6. Step 6: Final answer
    x = 286.75

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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.