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Finding the Fourth Proportional to 84.95, 117.18 and 61.68

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Solution

The fourth proportional to 84.95, 117.18 and 61.68 is: 85.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.95 : 117.18 = 61.68 : x
  2. Step 2: Convert to fraction form
    84.95/117.18 = 61.68/x
  3. Step 3: Cross multiply
    84.95x = 117.18 × 61.68
  4. Step 4: Simplify right side
    84.95x = 7,227.66
  5. Step 5: Solve for x
    x = 7,227.66/84.95
  6. Step 6: Final answer
    x = 85.08

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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.