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Finding the Fourth Proportional to 29.24, 40.31 and 21.45

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Solution

The fourth proportional to 29.24, 40.31 and 21.45 is: 29.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.24 : 40.31 = 21.45 : x
  2. Step 2: Convert to fraction form
    29.24/40.31 = 21.45/x
  3. Step 3: Cross multiply
    29.24x = 40.31 × 21.45
  4. Step 4: Simplify right side
    29.24x = 864.54
  5. Step 5: Solve for x
    x = 864.54/29.24
  6. Step 6: Final answer
    x = 29.57

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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.