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Finding the Fourth Proportional to 50.00, 74.97 and 21.15

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Solution

The fourth proportional to 50.00, 74.97 and 21.15 is: 31.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.00 : 74.97 = 21.15 : x
  2. Step 2: Convert to fraction form
    50.00/74.97 = 21.15/x
  3. Step 3: Cross multiply
    50.00x = 74.97 × 21.15
  4. Step 4: Simplify right side
    50.00x = 1,585.62
  5. Step 5: Solve for x
    x = 1,585.62/50.00
  6. Step 6: Final answer
    x = 31.72

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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.