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Finding the Fourth Proportional to 1,226.94, 1,693.18 and 667.42

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Solution

The fourth proportional to 1,226.94, 1,693.18 and 667.42 is: 921.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.94 : 1,693.18 = 667.42 : x
  2. Step 2: Convert to fraction form
    1,226.94/1,693.18 = 667.42/x
  3. Step 3: Cross multiply
    1,226.94x = 1,693.18 × 667.42
  4. Step 4: Simplify right side
    1,226.94x = 1,130,062.20
  5. Step 5: Solve for x
    x = 1,130,062.20/1,226.94
  6. Step 6: Final answer
    x = 921.04

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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.