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Finding the Fourth Proportional to 288.63, 398.31 and 157.64

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Solution

The fourth proportional to 288.63, 398.31 and 157.64 is: 217.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.63 : 398.31 = 157.64 : x
  2. Step 2: Convert to fraction form
    288.63/398.31 = 157.64/x
  3. Step 3: Cross multiply
    288.63x = 398.31 × 157.64
  4. Step 4: Simplify right side
    288.63x = 62,789.59
  5. Step 5: Solve for x
    x = 62,789.59/288.63
  6. Step 6: Final answer
    x = 217.54

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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.