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Finding the Fourth Proportional to 84.72, 117.12 and 67.68

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Solution

The fourth proportional to 84.72, 117.12 and 67.68 is: 93.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.72 : 117.12 = 67.68 : x
  2. Step 2: Convert to fraction form
    84.72/117.12 = 67.68/x
  3. Step 3: Cross multiply
    84.72x = 117.12 × 67.68
  4. Step 4: Simplify right side
    84.72x = 7,926.68
  5. Step 5: Solve for x
    x = 7,926.68/84.72
  6. Step 6: Final answer
    x = 93.56

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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.