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Finding the Fourth Proportional to 561.57, 775.44 and 396.15

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Solution

The fourth proportional to 561.57, 775.44 and 396.15 is: 547.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.57 : 775.44 = 396.15 : x
  2. Step 2: Convert to fraction form
    561.57/775.44 = 396.15/x
  3. Step 3: Cross multiply
    561.57x = 775.44 × 396.15
  4. Step 4: Simplify right side
    561.57x = 307,190.56
  5. Step 5: Solve for x
    x = 307,190.56/561.57
  6. Step 6: Final answer
    x = 547.02

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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.