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Finding the Fourth Proportional to 1,168.11, 1,611.97 and 644.13

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Solution

The fourth proportional to 1,168.11, 1,611.97 and 644.13 is: 888.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,168.11 : 1,611.97 = 644.13 : x
  2. Step 2: Convert to fraction form
    1,168.11/1,611.97 = 644.13/x
  3. Step 3: Cross multiply
    1,168.11x = 1,611.97 × 644.13
  4. Step 4: Simplify right side
    1,168.11x = 1,038,318.24
  5. Step 5: Solve for x
    x = 1,038,318.24/1,168.11
  6. Step 6: Final answer
    x = 888.89

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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.