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Finding the Fourth Proportional to 1,224.11, 1,690.00 and 826.47

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Solution

The fourth proportional to 1,224.11, 1,690.00 and 826.47 is: 1,141.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.11 : 1,690.00 = 826.47 : x
  2. Step 2: Convert to fraction form
    1,224.11/1,690.00 = 826.47/x
  3. Step 3: Cross multiply
    1,224.11x = 1,690.00 × 826.47
  4. Step 4: Simplify right side
    1,224.11x = 1,396,732.23
  5. Step 5: Solve for x
    x = 1,396,732.23/1,224.11
  6. Step 6: Final answer
    x = 1,141.02

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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.