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Finding the Fourth Proportional to 694.42, 1,042.11 and 628.25

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Solution

The fourth proportional to 694.42, 1,042.11 and 628.25 is: 942.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.42 : 1,042.11 = 628.25 : x
  2. Step 2: Convert to fraction form
    694.42/1,042.11 = 628.25/x
  3. Step 3: Cross multiply
    694.42x = 1,042.11 × 628.25
  4. Step 4: Simplify right side
    694.42x = 654,700.40
  5. Step 5: Solve for x
    x = 654,700.40/694.42
  6. Step 6: Final answer
    x = 942.80

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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.