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Finding the Fourth Proportional to 1,212.38, 1,817.28 and 691.24

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Solution

The fourth proportional to 1,212.38, 1,817.28 and 691.24 is: 1,036.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.38 : 1,817.28 = 691.24 : x
  2. Step 2: Convert to fraction form
    1,212.38/1,817.28 = 691.24/x
  3. Step 3: Cross multiply
    1,212.38x = 1,817.28 × 691.24
  4. Step 4: Simplify right side
    1,212.38x = 1,256,176.63
  5. Step 5: Solve for x
    x = 1,256,176.63/1,212.38
  6. Step 6: Final answer
    x = 1,036.12

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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.