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Finding the Fourth Proportional to 68.48, 93.38 and 66.86

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Solution

The fourth proportional to 68.48, 93.38 and 66.86 is: 91.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.48 : 93.38 = 66.86 : x
  2. Step 2: Convert to fraction form
    68.48/93.38 = 66.86/x
  3. Step 3: Cross multiply
    68.48x = 93.38 × 66.86
  4. Step 4: Simplify right side
    68.48x = 6,243.39
  5. Step 5: Solve for x
    x = 6,243.39/68.48
  6. Step 6: Final answer
    x = 91.17

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.