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Finding the Fourth Proportional to 10.22, 15.31 and 5.65

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Solution

The fourth proportional to 10.22, 15.31 and 5.65 is: 8.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.22 : 15.31 = 5.65 : x
  2. Step 2: Convert to fraction form
    10.22/15.31 = 5.65/x
  3. Step 3: Cross multiply
    10.22x = 15.31 × 5.65
  4. Step 4: Simplify right side
    10.22x = 86.42
  5. Step 5: Solve for x
    x = 86.42/10.22
  6. Step 6: Final answer
    x = 8.46

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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.