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Finding the Fourth Proportional to 1,138.12, 1,703.11 and 826.13

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Solution

The fourth proportional to 1,138.12, 1,703.11 and 826.13 is: 1,236.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.12 : 1,703.11 = 826.13 : x
  2. Step 2: Convert to fraction form
    1,138.12/1,703.11 = 826.13/x
  3. Step 3: Cross multiply
    1,138.12x = 1,703.11 × 826.13
  4. Step 4: Simplify right side
    1,138.12x = 1,406,986.75
  5. Step 5: Solve for x
    x = 1,406,986.75/1,138.12
  6. Step 6: Final answer
    x = 1,236.24

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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.