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Finding the Fourth Proportional to 30.81, 42.52 and 17.88

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Solution

The fourth proportional to 30.81, 42.52 and 17.88 is: 24.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.81 : 42.52 = 17.88 : x
  2. Step 2: Convert to fraction form
    30.81/42.52 = 17.88/x
  3. Step 3: Cross multiply
    30.81x = 42.52 × 17.88
  4. Step 4: Simplify right side
    30.81x = 760.26
  5. Step 5: Solve for x
    x = 760.26/30.81
  6. Step 6: Final answer
    x = 24.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.