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Finding the Fourth Proportional to 442.78, 611.05 and 243.63

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Solution

The fourth proportional to 442.78, 611.05 and 243.63 is: 336.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.78 : 611.05 = 243.63 : x
  2. Step 2: Convert to fraction form
    442.78/611.05 = 243.63/x
  3. Step 3: Cross multiply
    442.78x = 611.05 × 243.63
  4. Step 4: Simplify right side
    442.78x = 148,872.94
  5. Step 5: Solve for x
    x = 148,872.94/442.78
  6. Step 6: Final answer
    x = 336.22

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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.