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Finding the Fourth Proportional to 99.21, 136.94 and 66.45

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Solution

The fourth proportional to 99.21, 136.94 and 66.45 is: 91.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.21 : 136.94 = 66.45 : x
  2. Step 2: Convert to fraction form
    99.21/136.94 = 66.45/x
  3. Step 3: Cross multiply
    99.21x = 136.94 × 66.45
  4. Step 4: Simplify right side
    99.21x = 9,099.66
  5. Step 5: Solve for x
    x = 9,099.66/99.21
  6. Step 6: Final answer
    x = 91.72

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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.