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Finding the Fourth Proportional to 22.65, 31.26 and 13.80

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Solution

The fourth proportional to 22.65, 31.26 and 13.80 is: 19.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.65 : 31.26 = 13.80 : x
  2. Step 2: Convert to fraction form
    22.65/31.26 = 13.80/x
  3. Step 3: Cross multiply
    22.65x = 31.26 × 13.80
  4. Step 4: Simplify right side
    22.65x = 431.39
  5. Step 5: Solve for x
    x = 431.39/22.65
  6. Step 6: Final answer
    x = 19.05

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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.