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Finding the Fourth Proportional to 409.19, 564.66 and 243.39

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Solution

The fourth proportional to 409.19, 564.66 and 243.39 is: 335.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.19 : 564.66 = 243.39 : x
  2. Step 2: Convert to fraction form
    409.19/564.66 = 243.39/x
  3. Step 3: Cross multiply
    409.19x = 564.66 × 243.39
  4. Step 4: Simplify right side
    409.19x = 137,432.60
  5. Step 5: Solve for x
    x = 137,432.60/409.19
  6. Step 6: Final answer
    x = 335.86

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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.