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Finding the Fourth Proportional to 269.70, 372.21 and 153.25

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Solution

The fourth proportional to 269.70, 372.21 and 153.25 is: 211.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.70 : 372.21 = 153.25 : x
  2. Step 2: Convert to fraction form
    269.70/372.21 = 153.25/x
  3. Step 3: Cross multiply
    269.70x = 372.21 × 153.25
  4. Step 4: Simplify right side
    269.70x = 57,041.18
  5. Step 5: Solve for x
    x = 57,041.18/269.70
  6. Step 6: Final answer
    x = 211.50

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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.