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Finding the Fourth Proportional to 66.36, 91.97 and 65.15

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Solution

The fourth proportional to 66.36, 91.97 and 65.15 is: 90.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.36 : 91.97 = 65.15 : x
  2. Step 2: Convert to fraction form
    66.36/91.97 = 65.15/x
  3. Step 3: Cross multiply
    66.36x = 91.97 × 65.15
  4. Step 4: Simplify right side
    66.36x = 5,991.47
  5. Step 5: Solve for x
    x = 5,991.47/66.36
  6. Step 6: Final answer
    x = 90.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.