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Finding the Fourth Proportional to 28.98, 39.89 and 26.80

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Solution

The fourth proportional to 28.98, 39.89 and 26.80 is: 36.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.98 : 39.89 = 26.80 : x
  2. Step 2: Convert to fraction form
    28.98/39.89 = 26.80/x
  3. Step 3: Cross multiply
    28.98x = 39.89 × 26.80
  4. Step 4: Simplify right side
    28.98x = 1,069.02
  5. Step 5: Solve for x
    x = 1,069.02/28.98
  6. Step 6: Final answer
    x = 36.89

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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.