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Finding the Fourth Proportional to 77, 106.22 and 58.56

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Solution

The fourth proportional to 77, 106.22 and 58.56 is: 80.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    77 : 106.22 = 58.56 : x
  2. Step 2: Convert to fraction form
    77/106.22 = 58.56/x
  3. Step 3: Cross multiply
    77x = 106.22 × 58.56
  4. Step 4: Simplify right side
    77x = 6,220.24
  5. Step 5: Solve for x
    x = 6,220.24/77
  6. Step 6: Final answer
    x = 80.78

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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.