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Finding the Fourth Proportional to 50.65, 75.90 and 39.21

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Solution

The fourth proportional to 50.65, 75.90 and 39.21 is: 58.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.65 : 75.90 = 39.21 : x
  2. Step 2: Convert to fraction form
    50.65/75.90 = 39.21/x
  3. Step 3: Cross multiply
    50.65x = 75.90 × 39.21
  4. Step 4: Simplify right side
    50.65x = 2,976.04
  5. Step 5: Solve for x
    x = 2,976.04/50.65
  6. Step 6: Final answer
    x = 58.76

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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.