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Finding the Fourth Proportional to 84.51, 126.62 and 61.68

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Solution

The fourth proportional to 84.51, 126.62 and 61.68 is: 92.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.51 : 126.62 = 61.68 : x
  2. Step 2: Convert to fraction form
    84.51/126.62 = 61.68/x
  3. Step 3: Cross multiply
    84.51x = 126.62 × 61.68
  4. Step 4: Simplify right side
    84.51x = 7,809.61
  5. Step 5: Solve for x
    x = 7,809.61/84.51
  6. Step 6: Final answer
    x = 92.41

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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.