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Finding the Fourth Proportional to 407.20, 561.72 and 249.76

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Solution

The fourth proportional to 407.20, 561.72 and 249.76 is: 344.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.20 : 561.72 = 249.76 : x
  2. Step 2: Convert to fraction form
    407.20/561.72 = 249.76/x
  3. Step 3: Cross multiply
    407.20x = 561.72 × 249.76
  4. Step 4: Simplify right side
    407.20x = 140,295.19
  5. Step 5: Solve for x
    x = 140,295.19/407.20
  6. Step 6: Final answer
    x = 344.54

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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.