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Finding the Fourth Proportional to 288.74, 398.16 and 285.09

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Solution

The fourth proportional to 288.74, 398.16 and 285.09 is: 393.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.74 : 398.16 = 285.09 : x
  2. Step 2: Convert to fraction form
    288.74/398.16 = 285.09/x
  3. Step 3: Cross multiply
    288.74x = 398.16 × 285.09
  4. Step 4: Simplify right side
    288.74x = 113,511.43
  5. Step 5: Solve for x
    x = 113,511.43/288.74
  6. Step 6: Final answer
    x = 393.13

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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.