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Finding the Fourth Proportional to 631.40, 947.19 and 220.66

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Solution

The fourth proportional to 631.40, 947.19 and 220.66 is: 331.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.40 : 947.19 = 220.66 : x
  2. Step 2: Convert to fraction form
    631.40/947.19 = 220.66/x
  3. Step 3: Cross multiply
    631.40x = 947.19 × 220.66
  4. Step 4: Simplify right side
    631.40x = 209,005.40
  5. Step 5: Solve for x
    x = 209,005.40/631.40
  6. Step 6: Final answer
    x = 331.02

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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.