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Finding the Fourth Proportional to 479.80, 720.46 and 412.06

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Solution

The fourth proportional to 479.80, 720.46 and 412.06 is: 618.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.80 : 720.46 = 412.06 : x
  2. Step 2: Convert to fraction form
    479.80/720.46 = 412.06/x
  3. Step 3: Cross multiply
    479.80x = 720.46 × 412.06
  4. Step 4: Simplify right side
    479.80x = 296,872.75
  5. Step 5: Solve for x
    x = 296,872.75/479.80
  6. Step 6: Final answer
    x = 618.74

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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.