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Finding the Fourth Proportional to 30.51, 45.77 and 16.81

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Solution

The fourth proportional to 30.51, 45.77 and 16.81 is: 25.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.51 : 45.77 = 16.81 : x
  2. Step 2: Convert to fraction form
    30.51/45.77 = 16.81/x
  3. Step 3: Cross multiply
    30.51x = 45.77 × 16.81
  4. Step 4: Simplify right side
    30.51x = 769.20
  5. Step 5: Solve for x
    x = 769.20/30.51
  6. Step 6: Final answer
    x = 25.21

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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.