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Finding the Fourth Proportional to 694.27, 1,039.89 and 538.99

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Solution

The fourth proportional to 694.27, 1,039.89 and 538.99 is: 807.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.27 : 1,039.89 = 538.99 : x
  2. Step 2: Convert to fraction form
    694.27/1,039.89 = 538.99/x
  3. Step 3: Cross multiply
    694.27x = 1,039.89 × 538.99
  4. Step 4: Simplify right side
    694.27x = 560,490.31
  5. Step 5: Solve for x
    x = 560,490.31/694.27
  6. Step 6: Final answer
    x = 807.31

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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.