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Finding the Fourth Proportional to 270.20, 372.90 and 153.80

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Solution

The fourth proportional to 270.20, 372.90 and 153.80 is: 212.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.20 : 372.90 = 153.80 : x
  2. Step 2: Convert to fraction form
    270.20/372.90 = 153.80/x
  3. Step 3: Cross multiply
    270.20x = 372.90 × 153.80
  4. Step 4: Simplify right side
    270.20x = 57,352.02
  5. Step 5: Solve for x
    x = 57,352.02/270.20
  6. Step 6: Final answer
    x = 212.26

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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.