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Finding the Fourth Proportional to 50.19, 69.19 and 42

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Solution

The fourth proportional to 50.19, 69.19 and 42 is: 57.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.19 : 69.19 = 42 : x
  2. Step 2: Convert to fraction form
    50.19/69.19 = 42/x
  3. Step 3: Cross multiply
    50.19x = 69.19 × 42
  4. Step 4: Simplify right side
    50.19x = 2,905.98
  5. Step 5: Solve for x
    x = 2,905.98/50.19
  6. Step 6: Final answer
    x = 57.90

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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.