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Finding the Fourth Proportional to 66.06, 91.17 and 39.84

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Solution

The fourth proportional to 66.06, 91.17 and 39.84 is: 54.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.06 : 91.17 = 39.84 : x
  2. Step 2: Convert to fraction form
    66.06/91.17 = 39.84/x
  3. Step 3: Cross multiply
    66.06x = 91.17 × 39.84
  4. Step 4: Simplify right side
    66.06x = 3,632.21
  5. Step 5: Solve for x
    x = 3,632.21/66.06
  6. Step 6: Final answer
    x = 54.98

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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.