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Finding the Fourth Proportional to 694.34, 1,040.90 and 261.40

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Solution

The fourth proportional to 694.34, 1,040.90 and 261.40 is: 391.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.34 : 1,040.90 = 261.40 : x
  2. Step 2: Convert to fraction form
    694.34/1,040.90 = 261.40/x
  3. Step 3: Cross multiply
    694.34x = 1,040.90 × 261.40
  4. Step 4: Simplify right side
    694.34x = 272,091.26
  5. Step 5: Solve for x
    x = 272,091.26/694.34
  6. Step 6: Final answer
    x = 391.87

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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.