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Finding the Fourth Proportional to 84.49, 126.73 and 36.40

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Solution

The fourth proportional to 84.49, 126.73 and 36.40 is: 54.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.49 : 126.73 = 36.40 : x
  2. Step 2: Convert to fraction form
    84.49/126.73 = 36.40/x
  3. Step 3: Cross multiply
    84.49x = 126.73 × 36.40
  4. Step 4: Simplify right side
    84.49x = 4,612.47
  5. Step 5: Solve for x
    x = 4,612.47/84.49
  6. Step 6: Final answer
    x = 54.59

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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.