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Finding the Fourth Proportional to 155.91, 213.25 and 153.39

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Solution

The fourth proportional to 155.91, 213.25 and 153.39 is: 209.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.91 : 213.25 = 153.39 : x
  2. Step 2: Convert to fraction form
    155.91/213.25 = 153.39/x
  3. Step 3: Cross multiply
    155.91x = 213.25 × 153.39
  4. Step 4: Simplify right side
    155.91x = 32,710.03
  5. Step 5: Solve for x
    x = 32,710.03/155.91
  6. Step 6: Final answer
    x = 209.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.