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Finding the Fourth Proportional to 213.56, 320.15 and 144.91

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Solution

The fourth proportional to 213.56, 320.15 and 144.91 is: 217.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.56 : 320.15 = 144.91 : x
  2. Step 2: Convert to fraction form
    213.56/320.15 = 144.91/x
  3. Step 3: Cross multiply
    213.56x = 320.15 × 144.91
  4. Step 4: Simplify right side
    213.56x = 46,392.94
  5. Step 5: Solve for x
    x = 46,392.94/213.56
  6. Step 6: Final answer
    x = 217.24

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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.