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Finding the Fourth Proportional to 213.54, 318.25 and 172.23

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Solution

The fourth proportional to 213.54, 318.25 and 172.23 is: 256.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.54 : 318.25 = 172.23 : x
  2. Step 2: Convert to fraction form
    213.54/318.25 = 172.23/x
  3. Step 3: Cross multiply
    213.54x = 318.25 × 172.23
  4. Step 4: Simplify right side
    213.54x = 54,811.70
  5. Step 5: Solve for x
    x = 54,811.70/213.54
  6. Step 6: Final answer
    x = 256.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.