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Finding the Fourth Proportional to 29.68, 40.99 and 20.45

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Solution

The fourth proportional to 29.68, 40.99 and 20.45 is: 28.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.68 : 40.99 = 20.45 : x
  2. Step 2: Convert to fraction form
    29.68/40.99 = 20.45/x
  3. Step 3: Cross multiply
    29.68x = 40.99 × 20.45
  4. Step 4: Simplify right side
    29.68x = 838.25
  5. Step 5: Solve for x
    x = 838.25/29.68
  6. Step 6: Final answer
    x = 28.24

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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.