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Finding the Fourth Proportional to 31.42, 43.30 and 30.66

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Solution

The fourth proportional to 31.42, 43.30 and 30.66 is: 42.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.42 : 43.30 = 30.66 : x
  2. Step 2: Convert to fraction form
    31.42/43.30 = 30.66/x
  3. Step 3: Cross multiply
    31.42x = 43.30 × 30.66
  4. Step 4: Simplify right side
    31.42x = 1,327.21
  5. Step 5: Solve for x
    x = 1,327.21/31.42
  6. Step 6: Final answer
    x = 42.25

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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.