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Finding the Fourth Proportional to 509.09, 763.61 and 220.50

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Solution

The fourth proportional to 509.09, 763.61 and 220.50 is: 330.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.09 : 763.61 = 220.50 : x
  2. Step 2: Convert to fraction form
    509.09/763.61 = 220.50/x
  3. Step 3: Cross multiply
    509.09x = 763.61 × 220.50
  4. Step 4: Simplify right side
    509.09x = 168,374.90
  5. Step 5: Solve for x
    x = 168,374.90/509.09
  6. Step 6: Final answer
    x = 330.74

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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.