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Finding the Fourth Proportional to 50.40, 69.90 and 45.60

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Solution

The fourth proportional to 50.40, 69.90 and 45.60 is: 63.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.40 : 69.90 = 45.60 : x
  2. Step 2: Convert to fraction form
    50.40/69.90 = 45.60/x
  3. Step 3: Cross multiply
    50.40x = 69.90 × 45.60
  4. Step 4: Simplify right side
    50.40x = 3,187.44
  5. Step 5: Solve for x
    x = 3,187.44/50.40
  6. Step 6: Final answer
    x = 63.24

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.