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Finding the Fourth Proportional to 694.72, 1,042.25 and 207.78

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Solution

The fourth proportional to 694.72, 1,042.25 and 207.78 is: 311.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.72 : 1,042.25 = 207.78 : x
  2. Step 2: Convert to fraction form
    694.72/1,042.25 = 207.78/x
  3. Step 3: Cross multiply
    694.72x = 1,042.25 × 207.78
  4. Step 4: Simplify right side
    694.72x = 216,558.71
  5. Step 5: Solve for x
    x = 216,558.71/694.72
  6. Step 6: Final answer
    x = 311.72

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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.