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Finding the Fourth Proportional to 29.30, 40.48 and 21.53

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Solution

The fourth proportional to 29.30, 40.48 and 21.53 is: 29.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.30 : 40.48 = 21.53 : x
  2. Step 2: Convert to fraction form
    29.30/40.48 = 21.53/x
  3. Step 3: Cross multiply
    29.30x = 40.48 × 21.53
  4. Step 4: Simplify right side
    29.30x = 871.58
  5. Step 5: Solve for x
    x = 871.58/29.30
  6. Step 6: Final answer
    x = 29.75

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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.