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Finding the Fourth Proportional to 77.08, 106.39 and 49.05

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Solution

The fourth proportional to 77.08, 106.39 and 49.05 is: 67.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.08 : 106.39 = 49.05 : x
  2. Step 2: Convert to fraction form
    77.08/106.39 = 49.05/x
  3. Step 3: Cross multiply
    77.08x = 106.39 × 49.05
  4. Step 4: Simplify right side
    77.08x = 5,218.18
  5. Step 5: Solve for x
    x = 5,218.18/77.08
  6. Step 6: Final answer
    x = 67.70

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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.