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Finding the Fourth Proportional to 67.68, 101.76 and 51.84

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Solution

The fourth proportional to 67.68, 101.76 and 51.84 is: 77.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.68 : 101.76 = 51.84 : x
  2. Step 2: Convert to fraction form
    67.68/101.76 = 51.84/x
  3. Step 3: Cross multiply
    67.68x = 101.76 × 51.84
  4. Step 4: Simplify right side
    67.68x = 5,275.24
  5. Step 5: Solve for x
    x = 5,275.24/67.68
  6. Step 6: Final answer
    x = 77.94

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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.