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Finding the Fourth Proportional to 28.48, 39.30 and 16.20

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Solution

The fourth proportional to 28.48, 39.30 and 16.20 is: 22.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.48 : 39.30 = 16.20 : x
  2. Step 2: Convert to fraction form
    28.48/39.30 = 16.20/x
  3. Step 3: Cross multiply
    28.48x = 39.30 × 16.20
  4. Step 4: Simplify right side
    28.48x = 636.75
  5. Step 5: Solve for x
    x = 636.75/28.48
  6. Step 6: Final answer
    x = 22.36

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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.