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Finding the Fourth Proportional to 1,226.66, 1,691.93 and 806.88

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Solution

The fourth proportional to 1,226.66, 1,691.93 and 806.88 is: 1,112.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.66 : 1,691.93 = 806.88 : x
  2. Step 2: Convert to fraction form
    1,226.66/1,691.93 = 806.88/x
  3. Step 3: Cross multiply
    1,226.66x = 1,691.93 × 806.88
  4. Step 4: Simplify right side
    1,226.66x = 1,365,186.50
  5. Step 5: Solve for x
    x = 1,365,186.50/1,226.66
  6. Step 6: Final answer
    x = 1,112.93

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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.