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Finding the Fourth Proportional to 66.39, 91.63 and 40.16

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Solution

The fourth proportional to 66.39, 91.63 and 40.16 is: 55.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.39 : 91.63 = 40.16 : x
  2. Step 2: Convert to fraction form
    66.39/91.63 = 40.16/x
  3. Step 3: Cross multiply
    66.39x = 91.63 × 40.16
  4. Step 4: Simplify right side
    66.39x = 3,679.99
  5. Step 5: Solve for x
    x = 3,679.99/66.39
  6. Step 6: Final answer
    x = 55.43

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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.