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Finding the Fourth Proportional to 84.08, 115.80 and 68.51

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Solution

The fourth proportional to 84.08, 115.80 and 68.51 is: 94.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.08 : 115.80 = 68.51 : x
  2. Step 2: Convert to fraction form
    84.08/115.80 = 68.51/x
  3. Step 3: Cross multiply
    84.08x = 115.80 × 68.51
  4. Step 4: Simplify right side
    84.08x = 7,932.88
  5. Step 5: Solve for x
    x = 7,932.88/84.08
  6. Step 6: Final answer
    x = 94.35

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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.