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Finding the Fourth Proportional to 288.99, 398.90 and 274.31

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Solution

The fourth proportional to 288.99, 398.90 and 274.31 is: 378.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.99 : 398.90 = 274.31 : x
  2. Step 2: Convert to fraction form
    288.99/398.90 = 274.31/x
  3. Step 3: Cross multiply
    288.99x = 398.90 × 274.31
  4. Step 4: Simplify right side
    288.99x = 109,418.89
  5. Step 5: Solve for x
    x = 109,418.89/288.99
  6. Step 6: Final answer
    x = 378.63

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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.