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Finding the Fourth Proportional to 561.96, 842.28 and 388.68

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Solution

The fourth proportional to 561.96, 842.28 and 388.68 is: 582.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.96 : 842.28 = 388.68 : x
  2. Step 2: Convert to fraction form
    561.96/842.28 = 388.68/x
  3. Step 3: Cross multiply
    561.96x = 842.28 × 388.68
  4. Step 4: Simplify right side
    561.96x = 327,377.39
  5. Step 5: Solve for x
    x = 327,377.39/561.96
  6. Step 6: Final answer
    x = 582.56

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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.