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Finding the Fourth Proportional to 253.69, 350.21 and 155.49

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Solution

The fourth proportional to 253.69, 350.21 and 155.49 is: 214.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.69 : 350.21 = 155.49 : x
  2. Step 2: Convert to fraction form
    253.69/350.21 = 155.49/x
  3. Step 3: Cross multiply
    253.69x = 350.21 × 155.49
  4. Step 4: Simplify right side
    253.69x = 54,454.15
  5. Step 5: Solve for x
    x = 54,454.15/253.69
  6. Step 6: Final answer
    x = 214.65

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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.