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Finding the Fourth Proportional to 99.45, 149.09 and 60.81

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Solution

The fourth proportional to 99.45, 149.09 and 60.81 is: 91.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.45 : 149.09 = 60.81 : x
  2. Step 2: Convert to fraction form
    99.45/149.09 = 60.81/x
  3. Step 3: Cross multiply
    99.45x = 149.09 × 60.81
  4. Step 4: Simplify right side
    99.45x = 9,066.16
  5. Step 5: Solve for x
    x = 9,066.16/99.45
  6. Step 6: Final answer
    x = 91.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.