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Finding the Fourth Proportional to 100.05, 150.06 and 39.21

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Solution

The fourth proportional to 100.05, 150.06 and 39.21 is: 58.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.05 : 150.06 = 39.21 : x
  2. Step 2: Convert to fraction form
    100.05/150.06 = 39.21/x
  3. Step 3: Cross multiply
    100.05x = 150.06 × 39.21
  4. Step 4: Simplify right side
    100.05x = 5,883.85
  5. Step 5: Solve for x
    x = 5,883.85/100.05
  6. Step 6: Final answer
    x = 58.81

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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.