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Finding the Fourth Proportional to 294.72, 442.39 and 140.78

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Solution

The fourth proportional to 294.72, 442.39 and 140.78 is: 211.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    294.72 : 442.39 = 140.78 : x
  2. Step 2: Convert to fraction form
    294.72/442.39 = 140.78/x
  3. Step 3: Cross multiply
    294.72x = 442.39 × 140.78
  4. Step 4: Simplify right side
    294.72x = 62,277.45
  5. Step 5: Solve for x
    x = 62,277.45/294.72
  6. Step 6: Final answer
    x = 211.31

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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.