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Finding the Fourth Proportional to 66.51, 91.83 and 63.09

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Solution

The fourth proportional to 66.51, 91.83 and 63.09 is: 87.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.51 : 91.83 = 63.09 : x
  2. Step 2: Convert to fraction form
    66.51/91.83 = 63.09/x
  3. Step 3: Cross multiply
    66.51x = 91.83 × 63.09
  4. Step 4: Simplify right side
    66.51x = 5,793.55
  5. Step 5: Solve for x
    x = 5,793.55/66.51
  6. Step 6: Final answer
    x = 87.11

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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.