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Finding the Fourth Proportional to 918.62, 1,266.86 and 821.42

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Solution

The fourth proportional to 918.62, 1,266.86 and 821.42 is: 1,132.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.62 : 1,266.86 = 821.42 : x
  2. Step 2: Convert to fraction form
    918.62/1,266.86 = 821.42/x
  3. Step 3: Cross multiply
    918.62x = 1,266.86 × 821.42
  4. Step 4: Simplify right side
    918.62x = 1,040,613.70
  5. Step 5: Solve for x
    x = 1,040,613.70/918.62
  6. Step 6: Final answer
    x = 1,132.81

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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.