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Finding the Fourth Proportional to 24, 33.18 and 21.12

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Solution

The fourth proportional to 24, 33.18 and 21.12 is: 29.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    24 : 33.18 = 21.12 : x
  2. Step 2: Convert to fraction form
    24/33.18 = 21.12/x
  3. Step 3: Cross multiply
    24x = 33.18 × 21.12
  4. Step 4: Simplify right side
    24x = 700.76
  5. Step 5: Solve for x
    x = 700.76/24
  6. Step 6: Final answer
    x = 29.20

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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.