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Finding the Fourth Proportional to 32.99, 45.50 and 20.72

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Solution

The fourth proportional to 32.99, 45.50 and 20.72 is: 28.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.99 : 45.50 = 20.72 : x
  2. Step 2: Convert to fraction form
    32.99/45.50 = 20.72/x
  3. Step 3: Cross multiply
    32.99x = 45.50 × 20.72
  4. Step 4: Simplify right side
    32.99x = 942.43
  5. Step 5: Solve for x
    x = 942.43/32.99
  6. Step 6: Final answer
    x = 28.57

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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.