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Finding the Fourth Proportional to 22.78, 31.38 and 15.48

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Solution

The fourth proportional to 22.78, 31.38 and 15.48 is: 21.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.78 : 31.38 = 15.48 : x
  2. Step 2: Convert to fraction form
    22.78/31.38 = 15.48/x
  3. Step 3: Cross multiply
    22.78x = 31.38 × 15.48
  4. Step 4: Simplify right side
    22.78x = 485.76
  5. Step 5: Solve for x
    x = 485.76/22.78
  6. Step 6: Final answer
    x = 21.32

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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.