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Finding the Fourth Proportional to 99.39, 149.05 and 38.51

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Solution

The fourth proportional to 99.39, 149.05 and 38.51 is: 57.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.39 : 149.05 = 38.51 : x
  2. Step 2: Convert to fraction form
    99.39/149.05 = 38.51/x
  3. Step 3: Cross multiply
    99.39x = 149.05 × 38.51
  4. Step 4: Simplify right side
    99.39x = 5,739.92
  5. Step 5: Solve for x
    x = 5,739.92/99.39
  6. Step 6: Final answer
    x = 57.75

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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.