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Finding the Fourth Proportional to 631.79, 947.70 and 220.97

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Solution

The fourth proportional to 631.79, 947.70 and 220.97 is: 331.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.79 : 947.70 = 220.97 : x
  2. Step 2: Convert to fraction form
    631.79/947.70 = 220.97/x
  3. Step 3: Cross multiply
    631.79x = 947.70 × 220.97
  4. Step 4: Simplify right side
    631.79x = 209,413.27
  5. Step 5: Solve for x
    x = 209,413.27/631.79
  6. Step 6: Final answer
    x = 331.46

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Double scale
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Similar ratio
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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.