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Finding the Fourth Proportional to 608.43, 912.78 and 243.20

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Solution

The fourth proportional to 608.43, 912.78 and 243.20 is: 364.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.43 : 912.78 = 243.20 : x
  2. Step 2: Convert to fraction form
    608.43/912.78 = 243.20/x
  3. Step 3: Cross multiply
    608.43x = 912.78 × 243.20
  4. Step 4: Simplify right side
    608.43x = 221,990.38
  5. Step 5: Solve for x
    x = 221,990.38/608.43
  6. Step 6: Final answer
    x = 364.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.