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Finding the Fourth Proportional to 29.28, 40.68 and 28.79

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Solution

The fourth proportional to 29.28, 40.68 and 28.79 is: 39.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.28 : 40.68 = 28.79 : x
  2. Step 2: Convert to fraction form
    29.28/40.68 = 28.79/x
  3. Step 3: Cross multiply
    29.28x = 40.68 × 28.79
  4. Step 4: Simplify right side
    29.28x = 1,170.83
  5. Step 5: Solve for x
    x = 1,170.83/29.28
  6. Step 6: Final answer
    x = 39.99

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Find fourth proportional to 14.64, 20.34 and 14.39
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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.