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Finding the Fourth Proportional to 631.84, 947.76 and 220.99

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Solution

The fourth proportional to 631.84, 947.76 and 220.99 is: 331.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.84 : 947.76 = 220.99 : x
  2. Step 2: Convert to fraction form
    631.84/947.76 = 220.99/x
  3. Step 3: Cross multiply
    631.84x = 947.76 × 220.99
  4. Step 4: Simplify right side
    631.84x = 209,445.48
  5. Step 5: Solve for x
    x = 209,445.48/631.84
  6. Step 6: Final answer
    x = 331.49

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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.