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Finding the Fourth Proportional to 71.25, 106.83 and 40.82

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Solution

The fourth proportional to 71.25, 106.83 and 40.82 is: 61.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.25 : 106.83 = 40.82 : x
  2. Step 2: Convert to fraction form
    71.25/106.83 = 40.82/x
  3. Step 3: Cross multiply
    71.25x = 106.83 × 40.82
  4. Step 4: Simplify right side
    71.25x = 4,360.27
  5. Step 5: Solve for x
    x = 4,360.27/71.25
  6. Step 6: Final answer
    x = 61.20

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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.