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Finding the Fourth Proportional to 98.72, 148.09 and 33.72

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Solution

The fourth proportional to 98.72, 148.09 and 33.72 is: 50.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.72 : 148.09 = 33.72 : x
  2. Step 2: Convert to fraction form
    98.72/148.09 = 33.72/x
  3. Step 3: Cross multiply
    98.72x = 148.09 × 33.72
  4. Step 4: Simplify right side
    98.72x = 4,992.92
  5. Step 5: Solve for x
    x = 4,992.92/98.72
  6. Step 6: Final answer
    x = 50.58

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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.