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Finding the Fourth Proportional to 65.87, 90.83 and 50.21

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Solution

The fourth proportional to 65.87, 90.83 and 50.21 is: 69.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.87 : 90.83 = 50.21 : x
  2. Step 2: Convert to fraction form
    65.87/90.83 = 50.21/x
  3. Step 3: Cross multiply
    65.87x = 90.83 × 50.21
  4. Step 4: Simplify right side
    65.87x = 4,560.57
  5. Step 5: Solve for x
    x = 4,560.57/65.87
  6. Step 6: Final answer
    x = 69.24

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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.