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Finding the Fourth Proportional to 43.40, 59.86 and 28.84

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Solution

The fourth proportional to 43.40, 59.86 and 28.84 is: 39.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.40 : 59.86 = 28.84 : x
  2. Step 2: Convert to fraction form
    43.40/59.86 = 28.84/x
  3. Step 3: Cross multiply
    43.40x = 59.86 × 28.84
  4. Step 4: Simplify right side
    43.40x = 1,726.36
  5. Step 5: Solve for x
    x = 1,726.36/43.40
  6. Step 6: Final answer
    x = 39.78

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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.