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Finding the Fourth Proportional to 67.88, 101.80 and 19.76

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Solution

The fourth proportional to 67.88, 101.80 and 19.76 is: 29.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.88 : 101.80 = 19.76 : x
  2. Step 2: Convert to fraction form
    67.88/101.80 = 19.76/x
  3. Step 3: Cross multiply
    67.88x = 101.80 × 19.76
  4. Step 4: Simplify right side
    67.88x = 2,011.57
  5. Step 5: Solve for x
    x = 2,011.57/67.88
  6. Step 6: Final answer
    x = 29.63

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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.