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Finding the Fourth Proportional to 1,171.96, 1,617.28 and 640.84

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Solution

The fourth proportional to 1,171.96, 1,617.28 and 640.84 is: 884.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.96 : 1,617.28 = 640.84 : x
  2. Step 2: Convert to fraction form
    1,171.96/1,617.28 = 640.84/x
  3. Step 3: Cross multiply
    1,171.96x = 1,617.28 × 640.84
  4. Step 4: Simplify right side
    1,171.96x = 1,036,417.72
  5. Step 5: Solve for x
    x = 1,036,417.72/1,171.96
  6. Step 6: Final answer
    x = 884.35

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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.