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Finding the Fourth Proportional to 509.27, 763.49 and 220.55

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Solution

The fourth proportional to 509.27, 763.49 and 220.55 is: 330.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.27 : 763.49 = 220.55 : x
  2. Step 2: Convert to fraction form
    509.27/763.49 = 220.55/x
  3. Step 3: Cross multiply
    509.27x = 763.49 × 220.55
  4. Step 4: Simplify right side
    509.27x = 168,384.45
  5. Step 5: Solve for x
    x = 168,384.45/509.27
  6. Step 6: Final answer
    x = 330.64

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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.