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Finding the Fourth Proportional to 280.94, 418.97 and 257.31

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Solution

The fourth proportional to 280.94, 418.97 and 257.31 is: 383.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.94 : 418.97 = 257.31 : x
  2. Step 2: Convert to fraction form
    280.94/418.97 = 257.31/x
  3. Step 3: Cross multiply
    280.94x = 418.97 × 257.31
  4. Step 4: Simplify right side
    280.94x = 107,805.81
  5. Step 5: Solve for x
    x = 107,805.81/280.94
  6. Step 6: Final answer
    x = 383.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.