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Finding the Fourth Proportional to 631.56, 947.28 and 220.68

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Solution

The fourth proportional to 631.56, 947.28 and 220.68 is: 331.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.56 : 947.28 = 220.68 : x
  2. Step 2: Convert to fraction form
    631.56/947.28 = 220.68/x
  3. Step 3: Cross multiply
    631.56x = 947.28 × 220.68
  4. Step 4: Simplify right side
    631.56x = 209,045.75
  5. Step 5: Solve for x
    x = 209,045.75/631.56
  6. Step 6: Final answer
    x = 331.00

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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.