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Finding the Fourth Proportional to 561.67, 773.22 and 421.55

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Solution

The fourth proportional to 561.67, 773.22 and 421.55 is: 580.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.67 : 773.22 = 421.55 : x
  2. Step 2: Convert to fraction form
    561.67/773.22 = 421.55/x
  3. Step 3: Cross multiply
    561.67x = 773.22 × 421.55
  4. Step 4: Simplify right side
    561.67x = 325,951.51
  5. Step 5: Solve for x
    x = 325,951.51/561.67
  6. Step 6: Final answer
    x = 580.33

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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.