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Finding the Fourth Proportional to 509.46, 764.16 and 220.86

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Solution

The fourth proportional to 509.46, 764.16 and 220.86 is: 331.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.46 : 764.16 = 220.86 : x
  2. Step 2: Convert to fraction form
    509.46/764.16 = 220.86/x
  3. Step 3: Cross multiply
    509.46x = 764.16 × 220.86
  4. Step 4: Simplify right side
    509.46x = 168,772.38
  5. Step 5: Solve for x
    x = 168,772.38/509.46
  6. Step 6: Final answer
    x = 331.28

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Double scale
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Similar ratio
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1.5x scale

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.