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Finding the Fourth Proportional to 54.21, 74.90 and 39.50

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Solution

The fourth proportional to 54.21, 74.90 and 39.50 is: 54.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.21 : 74.90 = 39.50 : x
  2. Step 2: Convert to fraction form
    54.21/74.90 = 39.50/x
  3. Step 3: Cross multiply
    54.21x = 74.90 × 39.50
  4. Step 4: Simplify right side
    54.21x = 2,958.35
  5. Step 5: Solve for x
    x = 2,958.35/54.21
  6. Step 6: Final answer
    x = 54.57

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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.