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Finding the Fourth Proportional to 84.07, 115.68 and 68.47

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Solution

The fourth proportional to 84.07, 115.68 and 68.47 is: 94.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.07 : 115.68 = 68.47 : x
  2. Step 2: Convert to fraction form
    84.07/115.68 = 68.47/x
  3. Step 3: Cross multiply
    84.07x = 115.68 × 68.47
  4. Step 4: Simplify right side
    84.07x = 7,920.61
  5. Step 5: Solve for x
    x = 7,920.61/84.07
  6. Step 6: Final answer
    x = 94.21

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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.