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Finding the Fourth Proportional to 84.71, 117.47 and 81.98

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Solution

The fourth proportional to 84.71, 117.47 and 81.98 is: 113.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.71 : 117.47 = 81.98 : x
  2. Step 2: Convert to fraction form
    84.71/117.47 = 81.98/x
  3. Step 3: Cross multiply
    84.71x = 117.47 × 81.98
  4. Step 4: Simplify right side
    84.71x = 9,630.19
  5. Step 5: Solve for x
    x = 9,630.19/84.71
  6. Step 6: Final answer
    x = 113.68

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.