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Finding the Fourth Proportional to 509.71, 764.64 and 221.14

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Solution

The fourth proportional to 509.71, 764.64 and 221.14 is: 331.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.71 : 764.64 = 221.14 : x
  2. Step 2: Convert to fraction form
    509.71/764.64 = 221.14/x
  3. Step 3: Cross multiply
    509.71x = 764.64 × 221.14
  4. Step 4: Simplify right side
    509.71x = 169,092.49
  5. Step 5: Solve for x
    x = 169,092.49/509.71
  6. Step 6: Final answer
    x = 331.74

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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.