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Finding the Fourth Proportional to 31.03, 42.86 and 30.22

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Solution

The fourth proportional to 31.03, 42.86 and 30.22 is: 41.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.03 : 42.86 = 30.22 : x
  2. Step 2: Convert to fraction form
    31.03/42.86 = 30.22/x
  3. Step 3: Cross multiply
    31.03x = 42.86 × 30.22
  4. Step 4: Simplify right side
    31.03x = 1,295.20
  5. Step 5: Solve for x
    x = 1,295.20/31.03
  6. Step 6: Final answer
    x = 41.74

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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.