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Finding the Fourth Proportional to 1,171.91, 1,617.17 and 699.81

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Solution

The fourth proportional to 1,171.91, 1,617.17 and 699.81 is: 965.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.91 : 1,617.17 = 699.81 : x
  2. Step 2: Convert to fraction form
    1,171.91/1,617.17 = 699.81/x
  3. Step 3: Cross multiply
    1,171.91x = 1,617.17 × 699.81
  4. Step 4: Simplify right side
    1,171.91x = 1,131,708.24
  5. Step 5: Solve for x
    x = 1,131,708.24/1,171.91
  6. Step 6: Final answer
    x = 965.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.