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Finding the Fourth Proportional to 50.64, 75.89 and 20.19

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Solution

The fourth proportional to 50.64, 75.89 and 20.19 is: 30.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.64 : 75.89 = 20.19 : x
  2. Step 2: Convert to fraction form
    50.64/75.89 = 20.19/x
  3. Step 3: Cross multiply
    50.64x = 75.89 × 20.19
  4. Step 4: Simplify right side
    50.64x = 1,531.74
  5. Step 5: Solve for x
    x = 1,531.74/50.64
  6. Step 6: Final answer
    x = 30.25

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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.