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Finding the Fourth Proportional to 52.20, 77.75 and 50.31

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Solution

The fourth proportional to 52.20, 77.75 and 50.31 is: 74.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.20 : 77.75 = 50.31 : x
  2. Step 2: Convert to fraction form
    52.20/77.75 = 50.31/x
  3. Step 3: Cross multiply
    52.20x = 77.75 × 50.31
  4. Step 4: Simplify right side
    52.20x = 3,911.35
  5. Step 5: Solve for x
    x = 3,911.35/52.20
  6. Step 6: Final answer
    x = 74.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.