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Finding the Fourth Proportional to 29.34, 40.66 and 28.80

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Solution

The fourth proportional to 29.34, 40.66 and 28.80 is: 39.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.34 : 40.66 = 28.80 : x
  2. Step 2: Convert to fraction form
    29.34/40.66 = 28.80/x
  3. Step 3: Cross multiply
    29.34x = 40.66 × 28.80
  4. Step 4: Simplify right side
    29.34x = 1,171.01
  5. Step 5: Solve for x
    x = 1,171.01/29.34
  6. Step 6: Final answer
    x = 39.91

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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.