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Finding the Fourth Proportional to 99, 136.67 and 60.21

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Solution

The fourth proportional to 99, 136.67 and 60.21 is: 83.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    99 : 136.67 = 60.21 : x
  2. Step 2: Convert to fraction form
    99/136.67 = 60.21/x
  3. Step 3: Cross multiply
    99x = 136.67 × 60.21
  4. Step 4: Simplify right side
    99x = 8,228.60
  5. Step 5: Solve for x
    x = 8,228.60/99
  6. Step 6: Final answer
    x = 83.12

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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.