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Finding the Fourth Proportional to 159.99, 221.20 and 157.66

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Solution

The fourth proportional to 159.99, 221.20 and 157.66 is: 217.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.99 : 221.20 = 157.66 : x
  2. Step 2: Convert to fraction form
    159.99/221.20 = 157.66/x
  3. Step 3: Cross multiply
    159.99x = 221.20 × 157.66
  4. Step 4: Simplify right side
    159.99x = 34,874.39
  5. Step 5: Solve for x
    x = 34,874.39/159.99
  6. Step 6: Final answer
    x = 217.99

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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.