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Finding the Fourth Proportional to 99.62, 138.21 and 94.60

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Solution

The fourth proportional to 99.62, 138.21 and 94.60 is: 131.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.62 : 138.21 = 94.60 : x
  2. Step 2: Convert to fraction form
    99.62/138.21 = 94.60/x
  3. Step 3: Cross multiply
    99.62x = 138.21 × 94.60
  4. Step 4: Simplify right side
    99.62x = 13,074.48
  5. Step 5: Solve for x
    x = 13,074.48/99.62
  6. Step 6: Final answer
    x = 131.25

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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.