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Finding the Fourth Proportional to 579.78, 800.15 and 393.66

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Solution

The fourth proportional to 579.78, 800.15 and 393.66 is: 543.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.78 : 800.15 = 393.66 : x
  2. Step 2: Convert to fraction form
    579.78/800.15 = 393.66/x
  3. Step 3: Cross multiply
    579.78x = 800.15 × 393.66
  4. Step 4: Simplify right side
    579.78x = 314,987.05
  5. Step 5: Solve for x
    x = 314,987.05/579.78
  6. Step 6: Final answer
    x = 543.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.