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Finding the Fourth Proportional to 159.36, 219.93 and 120.21

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Solution

The fourth proportional to 159.36, 219.93 and 120.21 is: 165.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.36 : 219.93 = 120.21 : x
  2. Step 2: Convert to fraction form
    159.36/219.93 = 120.21/x
  3. Step 3: Cross multiply
    159.36x = 219.93 × 120.21
  4. Step 4: Simplify right side
    159.36x = 26,437.79
  5. Step 5: Solve for x
    x = 26,437.79/159.36
  6. Step 6: Final answer
    x = 165.90

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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.