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Finding the Fourth Proportional to 696.71, 1,044.36 and 388.70

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Solution

The fourth proportional to 696.71, 1,044.36 and 388.70 is: 582.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.71 : 1,044.36 = 388.70 : x
  2. Step 2: Convert to fraction form
    696.71/1,044.36 = 388.70/x
  3. Step 3: Cross multiply
    696.71x = 1,044.36 × 388.70
  4. Step 4: Simplify right side
    696.71x = 405,942.73
  5. Step 5: Solve for x
    x = 405,942.73/696.71
  6. Step 6: Final answer
    x = 582.66

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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.