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Finding the Fourth Proportional to 42.69, 58.95 and 28.17

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Solution

The fourth proportional to 42.69, 58.95 and 28.17 is: 38.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.69 : 58.95 = 28.17 : x
  2. Step 2: Convert to fraction form
    42.69/58.95 = 28.17/x
  3. Step 3: Cross multiply
    42.69x = 58.95 × 28.17
  4. Step 4: Simplify right side
    42.69x = 1,660.62
  5. Step 5: Solve for x
    x = 1,660.62/42.69
  6. Step 6: Final answer
    x = 38.90

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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.