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Finding the Fourth Proportional to 29.53, 40.80 and 21.33

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Solution

The fourth proportional to 29.53, 40.80 and 21.33 is: 29.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.53 : 40.80 = 21.33 : x
  2. Step 2: Convert to fraction form
    29.53/40.80 = 21.33/x
  3. Step 3: Cross multiply
    29.53x = 40.80 × 21.33
  4. Step 4: Simplify right side
    29.53x = 870.26
  5. Step 5: Solve for x
    x = 870.26/29.53
  6. Step 6: Final answer
    x = 29.47

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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.