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Finding the Fourth Proportional to 1,479.20, 2,218.80 and 505.22

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Solution

The fourth proportional to 1,479.20, 2,218.80 and 505.22 is: 757.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.20 : 2,218.80 = 505.22 : x
  2. Step 2: Convert to fraction form
    1,479.20/2,218.80 = 505.22/x
  3. Step 3: Cross multiply
    1,479.20x = 2,218.80 × 505.22
  4. Step 4: Simplify right side
    1,479.20x = 1,120,982.14
  5. Step 5: Solve for x
    x = 1,120,982.14/1,479.20
  6. Step 6: Final answer
    x = 757.83

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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.