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Finding the Fourth Proportional to 288.48, 398.11 and 157.49

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Solution

The fourth proportional to 288.48, 398.11 and 157.49 is: 217.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.48 : 398.11 = 157.49 : x
  2. Step 2: Convert to fraction form
    288.48/398.11 = 157.49/x
  3. Step 3: Cross multiply
    288.48x = 398.11 × 157.49
  4. Step 4: Simplify right side
    288.48x = 62,698.34
  5. Step 5: Solve for x
    x = 62,698.34/288.48
  6. Step 6: Final answer
    x = 217.34

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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.