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Finding the Fourth Proportional to 509.63, 764.44 and 221.06

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Solution

The fourth proportional to 509.63, 764.44 and 221.06 is: 331.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.63 : 764.44 = 221.06 : x
  2. Step 2: Convert to fraction form
    509.63/764.44 = 221.06/x
  3. Step 3: Cross multiply
    509.63x = 764.44 × 221.06
  4. Step 4: Simplify right side
    509.63x = 168,988.46
  5. Step 5: Solve for x
    x = 168,988.46/509.63
  6. Step 6: Final answer
    x = 331.59

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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.