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Finding the Fourth Proportional to 407.28, 561.93 and 249.86

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Solution

The fourth proportional to 407.28, 561.93 and 249.86 is: 344.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.28 : 561.93 = 249.86 : x
  2. Step 2: Convert to fraction form
    407.28/561.93 = 249.86/x
  3. Step 3: Cross multiply
    407.28x = 561.93 × 249.86
  4. Step 4: Simplify right side
    407.28x = 140,403.83
  5. Step 5: Solve for x
    x = 140,403.83/407.28
  6. Step 6: Final answer
    x = 344.74

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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.