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Finding the Fourth Proportional to 1,098.67, 1,648.38 and 636.85

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Solution

The fourth proportional to 1,098.67, 1,648.38 and 636.85 is: 955.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.67 : 1,648.38 = 636.85 : x
  2. Step 2: Convert to fraction form
    1,098.67/1,648.38 = 636.85/x
  3. Step 3: Cross multiply
    1,098.67x = 1,648.38 × 636.85
  4. Step 4: Simplify right side
    1,098.67x = 1,049,770.80
  5. Step 5: Solve for x
    x = 1,049,770.80/1,098.67
  6. Step 6: Final answer
    x = 955.49

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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.