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Finding the Fourth Proportional to 1,194.39, 1,648.36 and 663.31

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Solution

The fourth proportional to 1,194.39, 1,648.36 and 663.31 is: 915.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,194.39 : 1,648.36 = 663.31 : x
  2. Step 2: Convert to fraction form
    1,194.39/1,648.36 = 663.31/x
  3. Step 3: Cross multiply
    1,194.39x = 1,648.36 × 663.31
  4. Step 4: Simplify right side
    1,194.39x = 1,093,367.89
  5. Step 5: Solve for x
    x = 1,093,367.89/1,194.39
  6. Step 6: Final answer
    x = 915.42

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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.