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Finding the Fourth Proportional to 66.68, 92.01 and 39.05

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Solution

The fourth proportional to 66.68, 92.01 and 39.05 is: 53.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.68 : 92.01 = 39.05 : x
  2. Step 2: Convert to fraction form
    66.68/92.01 = 39.05/x
  3. Step 3: Cross multiply
    66.68x = 92.01 × 39.05
  4. Step 4: Simplify right side
    66.68x = 3,592.34
  5. Step 5: Solve for x
    x = 3,592.34/66.68
  6. Step 6: Final answer
    x = 53.88

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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.