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Finding the Fourth Proportional to 708.44, 1,067.15 and 655

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Solution

The fourth proportional to 708.44, 1,067.15 and 655 is: 986.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.44 : 1,067.15 = 655 : x
  2. Step 2: Convert to fraction form
    708.44/1,067.15 = 655/x
  3. Step 3: Cross multiply
    708.44x = 1,067.15 × 655
  4. Step 4: Simplify right side
    708.44x = 698,983.25
  5. Step 5: Solve for x
    x = 698,983.25/708.44
  6. Step 6: Final answer
    x = 986.65

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.