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Finding the Fourth Proportional to 213.90, 320.18 and 159.66

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Solution

The fourth proportional to 213.90, 320.18 and 159.66 is: 238.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.90 : 320.18 = 159.66 : x
  2. Step 2: Convert to fraction form
    213.90/320.18 = 159.66/x
  3. Step 3: Cross multiply
    213.90x = 320.18 × 159.66
  4. Step 4: Simplify right side
    213.90x = 51,119.94
  5. Step 5: Solve for x
    x = 51,119.94/213.90
  6. Step 6: Final answer
    x = 238.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.