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Finding the Fourth Proportional to 631.51, 947.32 and 198.67

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Solution

The fourth proportional to 631.51, 947.32 and 198.67 is: 298.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.51 : 947.32 = 198.67 : x
  2. Step 2: Convert to fraction form
    631.51/947.32 = 198.67/x
  3. Step 3: Cross multiply
    631.51x = 947.32 × 198.67
  4. Step 4: Simplify right side
    631.51x = 188,204.06
  5. Step 5: Solve for x
    x = 188,204.06/631.51
  6. Step 6: Final answer
    x = 298.02

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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.