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Finding the Fourth Proportional to 557.85, 835.23 and 420.49

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Solution

The fourth proportional to 557.85, 835.23 and 420.49 is: 629.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.85 : 835.23 = 420.49 : x
  2. Step 2: Convert to fraction form
    557.85/835.23 = 420.49/x
  3. Step 3: Cross multiply
    557.85x = 835.23 × 420.49
  4. Step 4: Simplify right side
    557.85x = 351,205.86
  5. Step 5: Solve for x
    x = 351,205.86/557.85
  6. Step 6: Final answer
    x = 629.57

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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.