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Finding the Fourth Proportional to 694.40, 1,036.32 and 638.40

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Solution

The fourth proportional to 694.40, 1,036.32 and 638.40 is: 952.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.40 : 1,036.32 = 638.40 : x
  2. Step 2: Convert to fraction form
    694.40/1,036.32 = 638.40/x
  3. Step 3: Cross multiply
    694.40x = 1,036.32 × 638.40
  4. Step 4: Simplify right side
    694.40x = 661,586.69
  5. Step 5: Solve for x
    x = 661,586.69/694.40
  6. Step 6: Final answer
    x = 952.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.