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Finding the Fourth Proportional to 22.52, 31.08 and 12.68

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Solution

The fourth proportional to 22.52, 31.08 and 12.68 is: 17.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.52 : 31.08 = 12.68 : x
  2. Step 2: Convert to fraction form
    22.52/31.08 = 12.68/x
  3. Step 3: Cross multiply
    22.52x = 31.08 × 12.68
  4. Step 4: Simplify right side
    22.52x = 394.11
  5. Step 5: Solve for x
    x = 394.11/22.52
  6. Step 6: Final answer
    x = 17.50

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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.