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Finding the Fourth Proportional to 1,226.05, 1,691.91 and 702.07

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Solution

The fourth proportional to 1,226.05, 1,691.91 and 702.07 is: 968.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.05 : 1,691.91 = 702.07 : x
  2. Step 2: Convert to fraction form
    1,226.05/1,691.91 = 702.07/x
  3. Step 3: Cross multiply
    1,226.05x = 1,691.91 × 702.07
  4. Step 4: Simplify right side
    1,226.05x = 1,187,839.25
  5. Step 5: Solve for x
    x = 1,187,839.25/1,226.05
  6. Step 6: Final answer
    x = 968.83

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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.