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Finding the Fourth Proportional to 694.87, 1,042.31 and 477.79

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Solution

The fourth proportional to 694.87, 1,042.31 and 477.79 is: 716.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.87 : 1,042.31 = 477.79 : x
  2. Step 2: Convert to fraction form
    694.87/1,042.31 = 477.79/x
  3. Step 3: Cross multiply
    694.87x = 1,042.31 × 477.79
  4. Step 4: Simplify right side
    694.87x = 498,005.29
  5. Step 5: Solve for x
    x = 498,005.29/694.87
  6. Step 6: Final answer
    x = 716.69

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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.