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Finding the Fourth Proportional to 84.36, 126.56 and 38.74

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Solution

The fourth proportional to 84.36, 126.56 and 38.74 is: 58.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.36 : 126.56 = 38.74 : x
  2. Step 2: Convert to fraction form
    84.36/126.56 = 38.74/x
  3. Step 3: Cross multiply
    84.36x = 126.56 × 38.74
  4. Step 4: Simplify right side
    84.36x = 4,903.39
  5. Step 5: Solve for x
    x = 4,903.39/84.36
  6. Step 6: Final answer
    x = 58.12

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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.