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Finding the Fourth Proportional to 42.28, 58.35 and 27.74

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Solution

The fourth proportional to 42.28, 58.35 and 27.74 is: 38.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.28 : 58.35 = 27.74 : x
  2. Step 2: Convert to fraction form
    42.28/58.35 = 27.74/x
  3. Step 3: Cross multiply
    42.28x = 58.35 × 27.74
  4. Step 4: Simplify right side
    42.28x = 1,618.63
  5. Step 5: Solve for x
    x = 1,618.63/42.28
  6. Step 6: Final answer
    x = 38.28

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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.