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Finding the Fourth Proportional to 42.21, 58.41 and 38.57

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Solution

The fourth proportional to 42.21, 58.41 and 38.57 is: 53.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.21 : 58.41 = 38.57 : x
  2. Step 2: Convert to fraction form
    42.21/58.41 = 38.57/x
  3. Step 3: Cross multiply
    42.21x = 58.41 × 38.57
  4. Step 4: Simplify right side
    42.21x = 2,252.58
  5. Step 5: Solve for x
    x = 2,252.58/42.21
  6. Step 6: Final answer
    x = 53.37

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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.