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Finding the Fourth Proportional to 280.93, 387.25 and 221.81

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Solution

The fourth proportional to 280.93, 387.25 and 221.81 is: 305.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.93 : 387.25 = 221.81 : x
  2. Step 2: Convert to fraction form
    280.93/387.25 = 221.81/x
  3. Step 3: Cross multiply
    280.93x = 387.25 × 221.81
  4. Step 4: Simplify right side
    280.93x = 85,895.92
  5. Step 5: Solve for x
    x = 85,895.92/280.93
  6. Step 6: Final answer
    x = 305.76

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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.