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Finding the Fourth Proportional to 631.49, 947.09 and 198.65

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Solution

The fourth proportional to 631.49, 947.09 and 198.65 is: 297.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.49 : 947.09 = 198.65 : x
  2. Step 2: Convert to fraction form
    631.49/947.09 = 198.65/x
  3. Step 3: Cross multiply
    631.49x = 947.09 × 198.65
  4. Step 4: Simplify right side
    631.49x = 188,133.70
  5. Step 5: Solve for x
    x = 188,133.70/631.49
  6. Step 6: Final answer
    x = 297.92

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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.