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Finding the Fourth Proportional to 28.74, 42.96 and 20.16

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Solution

The fourth proportional to 28.74, 42.96 and 20.16 is: 30.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.74 : 42.96 = 20.16 : x
  2. Step 2: Convert to fraction form
    28.74/42.96 = 20.16/x
  3. Step 3: Cross multiply
    28.74x = 42.96 × 20.16
  4. Step 4: Simplify right side
    28.74x = 866.07
  5. Step 5: Solve for x
    x = 866.07/28.74
  6. Step 6: Final answer
    x = 30.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.