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Finding the Fourth Proportional to 288.49, 398.09 and 187.36

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Solution

The fourth proportional to 288.49, 398.09 and 187.36 is: 258.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.49 : 398.09 = 187.36 : x
  2. Step 2: Convert to fraction form
    288.49/398.09 = 187.36/x
  3. Step 3: Cross multiply
    288.49x = 398.09 × 187.36
  4. Step 4: Simplify right side
    288.49x = 74,586.41
  5. Step 5: Solve for x
    x = 74,586.41/288.49
  6. Step 6: Final answer
    x = 258.54

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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.