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Finding the Fourth Proportional to 1,211.28, 1,817.18 and 691.53

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Solution

The fourth proportional to 1,211.28, 1,817.18 and 691.53 is: 1,037.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.28 : 1,817.18 = 691.53 : x
  2. Step 2: Convert to fraction form
    1,211.28/1,817.18 = 691.53/x
  3. Step 3: Cross multiply
    1,211.28x = 1,817.18 × 691.53
  4. Step 4: Simplify right side
    1,211.28x = 1,256,634.49
  5. Step 5: Solve for x
    x = 1,256,634.49/1,211.28
  6. Step 6: Final answer
    x = 1,037.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.