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Finding the Fourth Proportional to 84.49, 126.72 and 35.72

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Solution

The fourth proportional to 84.49, 126.72 and 35.72 is: 53.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.49 : 126.72 = 35.72 : x
  2. Step 2: Convert to fraction form
    84.49/126.72 = 35.72/x
  3. Step 3: Cross multiply
    84.49x = 126.72 × 35.72
  4. Step 4: Simplify right side
    84.49x = 4,525.80
  5. Step 5: Solve for x
    x = 4,525.80/84.49
  6. Step 6: Final answer
    x = 53.57

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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.