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Finding the Fourth Proportional to 77.21, 106.52 and 52.61

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Solution

The fourth proportional to 77.21, 106.52 and 52.61 is: 72.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.21 : 106.52 = 52.61 : x
  2. Step 2: Convert to fraction form
    77.21/106.52 = 52.61/x
  3. Step 3: Cross multiply
    77.21x = 106.52 × 52.61
  4. Step 4: Simplify right side
    77.21x = 5,603.22
  5. Step 5: Solve for x
    x = 5,603.22/77.21
  6. Step 6: Final answer
    x = 72.58

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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.