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Finding the Fourth Proportional to 52.10, 71.39 and 50.21

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Solution

The fourth proportional to 52.10, 71.39 and 50.21 is: 68.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.10 : 71.39 = 50.21 : x
  2. Step 2: Convert to fraction form
    52.10/71.39 = 50.21/x
  3. Step 3: Cross multiply
    52.10x = 71.39 × 50.21
  4. Step 4: Simplify right side
    52.10x = 3,583.88
  5. Step 5: Solve for x
    x = 3,583.88/52.10
  6. Step 6: Final answer
    x = 68.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.