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Finding the Fourth Proportional to 631.45, 947.05 and 220.61

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Solution

The fourth proportional to 631.45, 947.05 and 220.61 is: 330.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.45 : 947.05 = 220.61 : x
  2. Step 2: Convert to fraction form
    631.45/947.05 = 220.61/x
  3. Step 3: Cross multiply
    631.45x = 947.05 × 220.61
  4. Step 4: Simplify right side
    631.45x = 208,928.70
  5. Step 5: Solve for x
    x = 208,928.70/631.45
  6. Step 6: Final answer
    x = 330.87

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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.