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Finding the Fourth Proportional to 30.11, 45.16 and 13.87

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Solution

The fourth proportional to 30.11, 45.16 and 13.87 is: 20.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.11 : 45.16 = 13.87 : x
  2. Step 2: Convert to fraction form
    30.11/45.16 = 13.87/x
  3. Step 3: Cross multiply
    30.11x = 45.16 × 13.87
  4. Step 4: Simplify right side
    30.11x = 626.39
  5. Step 5: Solve for x
    x = 626.39/30.11
  6. Step 6: Final answer
    x = 20.81

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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.