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Finding the Fourth Proportional to 28.71, 42.99 and 19.68

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Solution

The fourth proportional to 28.71, 42.99 and 19.68 is: 29.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.71 : 42.99 = 19.68 : x
  2. Step 2: Convert to fraction form
    28.71/42.99 = 19.68/x
  3. Step 3: Cross multiply
    28.71x = 42.99 × 19.68
  4. Step 4: Simplify right side
    28.71x = 846.04
  5. Step 5: Solve for x
    x = 846.04/28.71
  6. Step 6: Final answer
    x = 29.47

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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.