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Finding the Fourth Proportional to 1,217.09, 1,825.61 and 826.11

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Solution

The fourth proportional to 1,217.09, 1,825.61 and 826.11 is: 1,239.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.09 : 1,825.61 = 826.11 : x
  2. Step 2: Convert to fraction form
    1,217.09/1,825.61 = 826.11/x
  3. Step 3: Cross multiply
    1,217.09x = 1,825.61 × 826.11
  4. Step 4: Simplify right side
    1,217.09x = 1,508,150.55
  5. Step 5: Solve for x
    x = 1,508,150.55/1,217.09
  6. Step 6: Final answer
    x = 1,239.14

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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.