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Finding the Fourth Proportional to 696.72, 1,039.41 and 677.91

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Solution

The fourth proportional to 696.72, 1,039.41 and 677.91 is: 1,011.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.72 : 1,039.41 = 677.91 : x
  2. Step 2: Convert to fraction form
    696.72/1,039.41 = 677.91/x
  3. Step 3: Cross multiply
    696.72x = 1,039.41 × 677.91
  4. Step 4: Simplify right side
    696.72x = 704,626.43
  5. Step 5: Solve for x
    x = 704,626.43/696.72
  6. Step 6: Final answer
    x = 1,011.35

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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.