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Finding the Fourth Proportional to 68.07, 93.81 and 66.90

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Solution

The fourth proportional to 68.07, 93.81 and 66.90 is: 92.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.07 : 93.81 = 66.90 : x
  2. Step 2: Convert to fraction form
    68.07/93.81 = 66.90/x
  3. Step 3: Cross multiply
    68.07x = 93.81 × 66.90
  4. Step 4: Simplify right side
    68.07x = 6,275.89
  5. Step 5: Solve for x
    x = 6,275.89/68.07
  6. Step 6: Final answer
    x = 92.20

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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.