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Finding the Fourth Proportional to 418.50, 577.60 and 243.85

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Solution

The fourth proportional to 418.50, 577.60 and 243.85 is: 336.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.50 : 577.60 = 243.85 : x
  2. Step 2: Convert to fraction form
    418.50/577.60 = 243.85/x
  3. Step 3: Cross multiply
    418.50x = 577.60 × 243.85
  4. Step 4: Simplify right side
    418.50x = 140,845.18
  5. Step 5: Solve for x
    x = 140,845.18/418.50
  6. Step 6: Final answer
    x = 336.55

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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.