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Finding the Fourth Proportional to 631.65, 947.39 and 198.75

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Solution

The fourth proportional to 631.65, 947.39 and 198.75 is: 298.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.65 : 947.39 = 198.75 : x
  2. Step 2: Convert to fraction form
    631.65/947.39 = 198.75/x
  3. Step 3: Cross multiply
    631.65x = 947.39 × 198.75
  4. Step 4: Simplify right side
    631.65x = 188,292.77
  5. Step 5: Solve for x
    x = 188,292.77/631.65
  6. Step 6: Final answer
    x = 298.10

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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.