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Finding the Fourth Proportional to 509.24, 763.79 and 220.64

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Solution

The fourth proportional to 509.24, 763.79 and 220.64 is: 330.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.24 : 763.79 = 220.64 : x
  2. Step 2: Convert to fraction form
    509.24/763.79 = 220.64/x
  3. Step 3: Cross multiply
    509.24x = 763.79 × 220.64
  4. Step 4: Simplify right side
    509.24x = 168,522.63
  5. Step 5: Solve for x
    x = 168,522.63/509.24
  6. Step 6: Final answer
    x = 330.93

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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.