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Finding the Fourth Proportional to 725.74, 1,089.66 and 479.68

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Solution

The fourth proportional to 725.74, 1,089.66 and 479.68 is: 720.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.74 : 1,089.66 = 479.68 : x
  2. Step 2: Convert to fraction form
    725.74/1,089.66 = 479.68/x
  3. Step 3: Cross multiply
    725.74x = 1,089.66 × 479.68
  4. Step 4: Simplify right side
    725.74x = 522,682.66
  5. Step 5: Solve for x
    x = 522,682.66/725.74
  6. Step 6: Final answer
    x = 720.21

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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.