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Finding the Fourth Proportional to 42.08, 58.06 and 28.25

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Solution

The fourth proportional to 42.08, 58.06 and 28.25 is: 38.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.08 : 58.06 = 28.25 : x
  2. Step 2: Convert to fraction form
    42.08/58.06 = 28.25/x
  3. Step 3: Cross multiply
    42.08x = 58.06 × 28.25
  4. Step 4: Simplify right side
    42.08x = 1,640.20
  5. Step 5: Solve for x
    x = 1,640.20/42.08
  6. Step 6: Final answer
    x = 38.98

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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.