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Finding the Fourth Proportional to 29.39, 43.75 and 28.79

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Solution

The fourth proportional to 29.39, 43.75 and 28.79 is: 42.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.39 : 43.75 = 28.79 : x
  2. Step 2: Convert to fraction form
    29.39/43.75 = 28.79/x
  3. Step 3: Cross multiply
    29.39x = 43.75 × 28.79
  4. Step 4: Simplify right side
    29.39x = 1,259.60
  5. Step 5: Solve for x
    x = 1,259.60/29.39
  6. Step 6: Final answer
    x = 42.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.