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Finding the Fourth Proportional to 30, 41.34 and 22.71

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Solution

The fourth proportional to 30, 41.34 and 22.71 is: 31.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    30 : 41.34 = 22.71 : x
  2. Step 2: Convert to fraction form
    30/41.34 = 22.71/x
  3. Step 3: Cross multiply
    30x = 41.34 × 22.71
  4. Step 4: Simplify right side
    30x = 938.83
  5. Step 5: Solve for x
    x = 938.83/30
  6. Step 6: Final answer
    x = 31.29

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1.5x scale

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.