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Finding the Fourth Proportional to 77.11, 106.29 and 53.78

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Solution

The fourth proportional to 77.11, 106.29 and 53.78 is: 74.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.11 : 106.29 = 53.78 : x
  2. Step 2: Convert to fraction form
    77.11/106.29 = 53.78/x
  3. Step 3: Cross multiply
    77.11x = 106.29 × 53.78
  4. Step 4: Simplify right side
    77.11x = 5,716.28
  5. Step 5: Solve for x
    x = 5,716.28/77.11
  6. Step 6: Final answer
    x = 74.13

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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.