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Finding the Fourth Proportional to 631.64, 947.36 and 198.90

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Solution

The fourth proportional to 631.64, 947.36 and 198.90 is: 298.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.64 : 947.36 = 198.90 : x
  2. Step 2: Convert to fraction form
    631.64/947.36 = 198.90/x
  3. Step 3: Cross multiply
    631.64x = 947.36 × 198.90
  4. Step 4: Simplify right side
    631.64x = 188,430.40
  5. Step 5: Solve for x
    x = 188,430.40/631.64
  6. Step 6: Final answer
    x = 298.32

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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.