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Finding the Fourth Proportional to 40.34, 55.67 and 21.92

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Solution

The fourth proportional to 40.34, 55.67 and 21.92 is: 30.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.34 : 55.67 = 21.92 : x
  2. Step 2: Convert to fraction form
    40.34/55.67 = 21.92/x
  3. Step 3: Cross multiply
    40.34x = 55.67 × 21.92
  4. Step 4: Simplify right side
    40.34x = 1,220.48
  5. Step 5: Solve for x
    x = 1,220.48/40.34
  6. Step 6: Final answer
    x = 30.25

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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.