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Finding the Fourth Proportional to 631.53, 947.30 and 198.72

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Solution

The fourth proportional to 631.53, 947.30 and 198.72 is: 298.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.53 : 947.30 = 198.72 : x
  2. Step 2: Convert to fraction form
    631.53/947.30 = 198.72/x
  3. Step 3: Cross multiply
    631.53x = 947.30 × 198.72
  4. Step 4: Simplify right side
    631.53x = 188,246.46
  5. Step 5: Solve for x
    x = 188,246.46/631.53
  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.