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Finding the Fourth Proportional to 84.36, 126.45 and 38.70

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Solution

The fourth proportional to 84.36, 126.45 and 38.70 is: 58.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.36 : 126.45 = 38.70 : x
  2. Step 2: Convert to fraction form
    84.36/126.45 = 38.70/x
  3. Step 3: Cross multiply
    84.36x = 126.45 × 38.70
  4. Step 4: Simplify right side
    84.36x = 4,893.62
  5. Step 5: Solve for x
    x = 4,893.62/84.36
  6. Step 6: Final answer
    x = 58.01

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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.