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Finding the Fourth Proportional to 694.60, 1,036.89 and 643.93

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Solution

The fourth proportional to 694.60, 1,036.89 and 643.93 is: 961.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.60 : 1,036.89 = 643.93 : x
  2. Step 2: Convert to fraction form
    694.60/1,036.89 = 643.93/x
  3. Step 3: Cross multiply
    694.60x = 1,036.89 × 643.93
  4. Step 4: Simplify right side
    694.60x = 667,684.58
  5. Step 5: Solve for x
    x = 667,684.58/694.60
  6. Step 6: Final answer
    x = 961.25

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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.