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Finding the Fourth Proportional to 23.84, 32.88 and 21.20

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Solution

The fourth proportional to 23.84, 32.88 and 21.20 is: 29.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.84 : 32.88 = 21.20 : x
  2. Step 2: Convert to fraction form
    23.84/32.88 = 21.20/x
  3. Step 3: Cross multiply
    23.84x = 32.88 × 21.20
  4. Step 4: Simplify right side
    23.84x = 697.06
  5. Step 5: Solve for x
    x = 697.06/23.84
  6. Step 6: Final answer
    x = 29.24

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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.