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Finding the Fourth Proportional to 288.39, 397.99 and 157.41

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Solution

The fourth proportional to 288.39, 397.99 and 157.41 is: 217.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.39 : 397.99 = 157.41 : x
  2. Step 2: Convert to fraction form
    288.39/397.99 = 157.41/x
  3. Step 3: Cross multiply
    288.39x = 397.99 × 157.41
  4. Step 4: Simplify right side
    288.39x = 62,646.22
  5. Step 5: Solve for x
    x = 62,646.22/288.39
  6. Step 6: Final answer
    x = 217.23

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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.