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Finding the Fourth Proportional to 288.42, 398.02 and 157.43

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Solution

The fourth proportional to 288.42, 398.02 and 157.43 is: 217.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.42 : 398.02 = 157.43 : x
  2. Step 2: Convert to fraction form
    288.42/398.02 = 157.43/x
  3. Step 3: Cross multiply
    288.42x = 398.02 × 157.43
  4. Step 4: Simplify right side
    288.42x = 62,659.99
  5. Step 5: Solve for x
    x = 62,659.99/288.42
  6. Step 6: Final answer
    x = 217.25

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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.