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Finding the Fourth Proportional to 561.55, 773.68 and 421.45

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Solution

The fourth proportional to 561.55, 773.68 and 421.45 is: 580.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.55 : 773.68 = 421.45 : x
  2. Step 2: Convert to fraction form
    561.55/773.68 = 421.45/x
  3. Step 3: Cross multiply
    561.55x = 773.68 × 421.45
  4. Step 4: Simplify right side
    561.55x = 326,067.44
  5. Step 5: Solve for x
    x = 326,067.44/561.55
  6. Step 6: Final answer
    x = 580.66

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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.