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Finding the Fourth Proportional to 42.10, 58.04 and 28.27

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Solution

The fourth proportional to 42.10, 58.04 and 28.27 is: 38.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.10 : 58.04 = 28.27 : x
  2. Step 2: Convert to fraction form
    42.10/58.04 = 28.27/x
  3. Step 3: Cross multiply
    42.10x = 58.04 × 28.27
  4. Step 4: Simplify right side
    42.10x = 1,641.01
  5. Step 5: Solve for x
    x = 1,641.01/42.10
  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.