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Finding the Fourth Proportional to 32.76, 45.18 and 21.78

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Solution

The fourth proportional to 32.76, 45.18 and 21.78 is: 30.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.76 : 45.18 = 21.78 : x
  2. Step 2: Convert to fraction form
    32.76/45.18 = 21.78/x
  3. Step 3: Cross multiply
    32.76x = 45.18 × 21.78
  4. Step 4: Simplify right side
    32.76x = 984.02
  5. Step 5: Solve for x
    x = 984.02/32.76
  6. Step 6: Final answer
    x = 30.04

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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.