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Finding the Fourth Proportional to 38.74, 58.05 and 28.06

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Solution

The fourth proportional to 38.74, 58.05 and 28.06 is: 42.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.74 : 58.05 = 28.06 : x
  2. Step 2: Convert to fraction form
    38.74/58.05 = 28.06/x
  3. Step 3: Cross multiply
    38.74x = 58.05 × 28.06
  4. Step 4: Simplify right side
    38.74x = 1,628.88
  5. Step 5: Solve for x
    x = 1,628.88/38.74
  6. Step 6: Final answer
    x = 42.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.