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Finding the Fourth Proportional to 240.24, 331.51 and 157.21

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Solution

The fourth proportional to 240.24, 331.51 and 157.21 is: 216.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.24 : 331.51 = 157.21 : x
  2. Step 2: Convert to fraction form
    240.24/331.51 = 157.21/x
  3. Step 3: Cross multiply
    240.24x = 331.51 × 157.21
  4. Step 4: Simplify right side
    240.24x = 52,117.62
  5. Step 5: Solve for x
    x = 52,117.62/240.24
  6. Step 6: Final answer
    x = 216.94

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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.