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Finding the Fourth Proportional to 631.57, 947.49 and 198.69

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Solution

The fourth proportional to 631.57, 947.49 and 198.69 is: 298.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.57 : 947.49 = 198.69 : x
  2. Step 2: Convert to fraction form
    631.57/947.49 = 198.69/x
  3. Step 3: Cross multiply
    631.57x = 947.49 × 198.69
  4. Step 4: Simplify right side
    631.57x = 188,255.79
  5. Step 5: Solve for x
    x = 188,255.79/631.57
  6. Step 6: Final answer
    x = 298.08

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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.