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Finding the Fourth Proportional to 84.66, 126.75 and 61.87

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Solution

The fourth proportional to 84.66, 126.75 and 61.87 is: 92.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.66 : 126.75 = 61.87 : x
  2. Step 2: Convert to fraction form
    84.66/126.75 = 61.87/x
  3. Step 3: Cross multiply
    84.66x = 126.75 × 61.87
  4. Step 4: Simplify right side
    84.66x = 7,842.02
  5. Step 5: Solve for x
    x = 7,842.02/84.66
  6. Step 6: Final answer
    x = 92.64

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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.