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Finding the Fourth Proportional to 288.58, 398.25 and 157.60

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Solution

The fourth proportional to 288.58, 398.25 and 157.60 is: 217.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.58 : 398.25 = 157.60 : x
  2. Step 2: Convert to fraction form
    288.58/398.25 = 157.60/x
  3. Step 3: Cross multiply
    288.58x = 398.25 × 157.60
  4. Step 4: Simplify right side
    288.58x = 62,764.20
  5. Step 5: Solve for x
    x = 62,764.20/288.58
  6. Step 6: Final answer
    x = 217.49

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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.