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Finding the Fourth Proportional to 42.80, 59.05 and 28.96

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Solution

The fourth proportional to 42.80, 59.05 and 28.96 is: 39.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.80 : 59.05 = 28.96 : x
  2. Step 2: Convert to fraction form
    42.80/59.05 = 28.96/x
  3. Step 3: Cross multiply
    42.80x = 59.05 × 28.96
  4. Step 4: Simplify right side
    42.80x = 1,710.09
  5. Step 5: Solve for x
    x = 1,710.09/42.80
  6. Step 6: Final answer
    x = 39.96

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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.