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Finding the Fourth Proportional to 479.96, 720.14 and 419.20

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Solution

The fourth proportional to 479.96, 720.14 and 419.20 is: 628.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.96 : 720.14 = 419.20 : x
  2. Step 2: Convert to fraction form
    479.96/720.14 = 419.20/x
  3. Step 3: Cross multiply
    479.96x = 720.14 × 419.20
  4. Step 4: Simplify right side
    479.96x = 301,882.69
  5. Step 5: Solve for x
    x = 301,882.69/479.96
  6. Step 6: Final answer
    x = 628.97

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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.