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Finding the Fourth Proportional to 509.43, 764.48 and 220.89

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Solution

The fourth proportional to 509.43, 764.48 and 220.89 is: 331.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.43 : 764.48 = 220.89 : x
  2. Step 2: Convert to fraction form
    509.43/764.48 = 220.89/x
  3. Step 3: Cross multiply
    509.43x = 764.48 × 220.89
  4. Step 4: Simplify right side
    509.43x = 168,864.88
  5. Step 5: Solve for x
    x = 168,864.88/509.43
  6. Step 6: Final answer
    x = 331.48

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Double scale
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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.