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Finding the Fourth Proportional to 694.68, 1,040.58 and 405.96

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Solution

The fourth proportional to 694.68, 1,040.58 and 405.96 is: 608.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.68 : 1,040.58 = 405.96 : x
  2. Step 2: Convert to fraction form
    694.68/1,040.58 = 405.96/x
  3. Step 3: Cross multiply
    694.68x = 1,040.58 × 405.96
  4. Step 4: Simplify right side
    694.68x = 422,433.86
  5. Step 5: Solve for x
    x = 422,433.86/694.68
  6. Step 6: Final answer
    x = 608.10

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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.