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Finding the Fourth Proportional to 68.16, 94.15 and 65.66

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Solution

The fourth proportional to 68.16, 94.15 and 65.66 is: 90.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.16 : 94.15 = 65.66 : x
  2. Step 2: Convert to fraction form
    68.16/94.15 = 65.66/x
  3. Step 3: Cross multiply
    68.16x = 94.15 × 65.66
  4. Step 4: Simplify right side
    68.16x = 6,181.89
  5. Step 5: Solve for x
    x = 6,181.89/68.16
  6. Step 6: Final answer
    x = 90.70

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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.