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Finding the Fourth Proportional to 829.78, 1,244.67 and 252.66

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Solution

The fourth proportional to 829.78, 1,244.67 and 252.66 is: 378.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.78 : 1,244.67 = 252.66 : x
  2. Step 2: Convert to fraction form
    829.78/1,244.67 = 252.66/x
  3. Step 3: Cross multiply
    829.78x = 1,244.67 × 252.66
  4. Step 4: Simplify right side
    829.78x = 314,474.13
  5. Step 5: Solve for x
    x = 314,474.13/829.78
  6. Step 6: Final answer
    x = 378.98

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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.