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Finding the Fourth Proportional to 68.77, 94.86 and 66.15

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Solution

The fourth proportional to 68.77, 94.86 and 66.15 is: 91.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.77 : 94.86 = 66.15 : x
  2. Step 2: Convert to fraction form
    68.77/94.86 = 66.15/x
  3. Step 3: Cross multiply
    68.77x = 94.86 × 66.15
  4. Step 4: Simplify right side
    68.77x = 6,274.99
  5. Step 5: Solve for x
    x = 6,274.99/68.77
  6. Step 6: Final answer
    x = 91.25

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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.