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Finding the Fourth Proportional to 28.17, 42.16 and 21.37

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Solution

The fourth proportional to 28.17, 42.16 and 21.37 is: 31.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.17 : 42.16 = 21.37 : x
  2. Step 2: Convert to fraction form
    28.17/42.16 = 21.37/x
  3. Step 3: Cross multiply
    28.17x = 42.16 × 21.37
  4. Step 4: Simplify right side
    28.17x = 900.84
  5. Step 5: Solve for x
    x = 900.84/28.17
  6. Step 6: Final answer
    x = 31.98

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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.