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Finding the Fourth Proportional to 631.48, 947.28 and 198.76

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Solution

The fourth proportional to 631.48, 947.28 and 198.76 is: 298.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.48 : 947.28 = 198.76 : x
  2. Step 2: Convert to fraction form
    631.48/947.28 = 198.76/x
  3. Step 3: Cross multiply
    631.48x = 947.28 × 198.76
  4. Step 4: Simplify right side
    631.48x = 188,281.37
  5. Step 5: Solve for x
    x = 188,281.37/631.48
  6. Step 6: Final answer
    x = 298.16

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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.