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Finding the Fourth Proportional to 66.21, 90.72 and 63.37

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Solution

The fourth proportional to 66.21, 90.72 and 63.37 is: 86.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.21 : 90.72 = 63.37 : x
  2. Step 2: Convert to fraction form
    66.21/90.72 = 63.37/x
  3. Step 3: Cross multiply
    66.21x = 90.72 × 63.37
  4. Step 4: Simplify right side
    66.21x = 5,748.93
  5. Step 5: Solve for x
    x = 5,748.93/66.21
  6. Step 6: Final answer
    x = 86.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.