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Finding the Fourth Proportional to 66.11, 91.33 and 49.71

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Solution

The fourth proportional to 66.11, 91.33 and 49.71 is: 68.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.11 : 91.33 = 49.71 : x
  2. Step 2: Convert to fraction form
    66.11/91.33 = 49.71/x
  3. Step 3: Cross multiply
    66.11x = 91.33 × 49.71
  4. Step 4: Simplify right side
    66.11x = 4,539.89
  5. Step 5: Solve for x
    x = 4,539.89/66.11
  6. Step 6: Final answer
    x = 68.67

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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.