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Finding the Fourth Proportional to 1,171.93, 1,617.24 and 640.81

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Solution

The fourth proportional to 1,171.93, 1,617.24 and 640.81 is: 884.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.93 : 1,617.24 = 640.81 : x
  2. Step 2: Convert to fraction form
    1,171.93/1,617.24 = 640.81/x
  3. Step 3: Cross multiply
    1,171.93x = 1,617.24 × 640.81
  4. Step 4: Simplify right side
    1,171.93x = 1,036,343.56
  5. Step 5: Solve for x
    x = 1,036,343.56/1,171.93
  6. Step 6: Final answer
    x = 884.31

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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.