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Finding the Fourth Proportional to 36.98, 55.49 and 21.79

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Solution

The fourth proportional to 36.98, 55.49 and 21.79 is: 32.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.98 : 55.49 = 21.79 : x
  2. Step 2: Convert to fraction form
    36.98/55.49 = 21.79/x
  3. Step 3: Cross multiply
    36.98x = 55.49 × 21.79
  4. Step 4: Simplify right side
    36.98x = 1,209.13
  5. Step 5: Solve for x
    x = 1,209.13/36.98
  6. Step 6: Final answer
    x = 32.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.