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Finding the Fourth Proportional to 84.61, 116.63 and 63.91

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Solution

The fourth proportional to 84.61, 116.63 and 63.91 is: 88.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.61 : 116.63 = 63.91 : x
  2. Step 2: Convert to fraction form
    84.61/116.63 = 63.91/x
  3. Step 3: Cross multiply
    84.61x = 116.63 × 63.91
  4. Step 4: Simplify right side
    84.61x = 7,453.24
  5. Step 5: Solve for x
    x = 7,453.24/84.61
  6. Step 6: Final answer
    x = 88.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.