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Finding the Fourth Proportional to 696.20, 1,038.85 and 679.73

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Solution

The fourth proportional to 696.20, 1,038.85 and 679.73 is: 1,014.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.20 : 1,038.85 = 679.73 : x
  2. Step 2: Convert to fraction form
    696.20/1,038.85 = 679.73/x
  3. Step 3: Cross multiply
    696.20x = 1,038.85 × 679.73
  4. Step 4: Simplify right side
    696.20x = 706,137.51
  5. Step 5: Solve for x
    x = 706,137.51/696.20
  6. Step 6: Final answer
    x = 1,014.27

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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.