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Finding the Fourth Proportional to 694.48, 1,042.18 and 638.86

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Solution

The fourth proportional to 694.48, 1,042.18 and 638.86 is: 958.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.48 : 1,042.18 = 638.86 : x
  2. Step 2: Convert to fraction form
    694.48/1,042.18 = 638.86/x
  3. Step 3: Cross multiply
    694.48x = 1,042.18 × 638.86
  4. Step 4: Simplify right side
    694.48x = 665,807.11
  5. Step 5: Solve for x
    x = 665,807.11/694.48
  6. Step 6: Final answer
    x = 958.71

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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.