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Finding the Fourth Proportional to 631.55, 947.28 and 220.64

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Solution

The fourth proportional to 631.55, 947.28 and 220.64 is: 330.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.55 : 947.28 = 220.64 : x
  2. Step 2: Convert to fraction form
    631.55/947.28 = 220.64/x
  3. Step 3: Cross multiply
    631.55x = 947.28 × 220.64
  4. Step 4: Simplify right side
    631.55x = 209,003.12
  5. Step 5: Solve for x
    x = 209,003.12/631.55
  6. Step 6: Final answer
    x = 330.94

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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.