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Finding the Fourth Proportional to 1,168.12, 1,611.90 and 663.96

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Solution

The fourth proportional to 1,168.12, 1,611.90 and 663.96 is: 916.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,168.12 : 1,611.90 = 663.96 : x
  2. Step 2: Convert to fraction form
    1,168.12/1,611.90 = 663.96/x
  3. Step 3: Cross multiply
    1,168.12x = 1,611.90 × 663.96
  4. Step 4: Simplify right side
    1,168.12x = 1,070,243.17
  5. Step 5: Solve for x
    x = 1,070,243.17/1,168.12
  6. Step 6: Final answer
    x = 916.21

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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.