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Finding the Fourth Proportional to 697.38, 1,043.99 and 422.64

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Solution

The fourth proportional to 697.38, 1,043.99 and 422.64 is: 632.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.38 : 1,043.99 = 422.64 : x
  2. Step 2: Convert to fraction form
    697.38/1,043.99 = 422.64/x
  3. Step 3: Cross multiply
    697.38x = 1,043.99 × 422.64
  4. Step 4: Simplify right side
    697.38x = 441,231.93
  5. Step 5: Solve for x
    x = 441,231.93/697.38
  6. Step 6: Final answer
    x = 632.70

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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.