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Finding the Fourth Proportional to 198.72, 297.92 and 70.40

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Solution

The fourth proportional to 198.72, 297.92 and 70.40 is: 105.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.72 : 297.92 = 70.40 : x
  2. Step 2: Convert to fraction form
    198.72/297.92 = 70.40/x
  3. Step 3: Cross multiply
    198.72x = 297.92 × 70.40
  4. Step 4: Simplify right side
    198.72x = 20,973.57
  5. Step 5: Solve for x
    x = 20,973.57/198.72
  6. Step 6: Final answer
    x = 105.54

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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.