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Finding the Fourth Proportional to 694.86, 1,042.48 and 261.78

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Solution

The fourth proportional to 694.86, 1,042.48 and 261.78 is: 392.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.86 : 1,042.48 = 261.78 : x
  2. Step 2: Convert to fraction form
    694.86/1,042.48 = 261.78/x
  3. Step 3: Cross multiply
    694.86x = 1,042.48 × 261.78
  4. Step 4: Simplify right side
    694.86x = 272,900.41
  5. Step 5: Solve for x
    x = 272,900.41/694.86
  6. Step 6: Final answer
    x = 392.74

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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.