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Finding the Fourth Proportional to 50.57, 69.70 and 40.05

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Solution

The fourth proportional to 50.57, 69.70 and 40.05 is: 55.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.57 : 69.70 = 40.05 : x
  2. Step 2: Convert to fraction form
    50.57/69.70 = 40.05/x
  3. Step 3: Cross multiply
    50.57x = 69.70 × 40.05
  4. Step 4: Simplify right side
    50.57x = 2,791.49
  5. Step 5: Solve for x
    x = 2,791.49/50.57
  6. Step 6: Final answer
    x = 55.20

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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.