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Finding the Fourth Proportional to 253.21, 349.49 and 211.69

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Solution

The fourth proportional to 253.21, 349.49 and 211.69 is: 292.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.21 : 349.49 = 211.69 : x
  2. Step 2: Convert to fraction form
    253.21/349.49 = 211.69/x
  3. Step 3: Cross multiply
    253.21x = 349.49 × 211.69
  4. Step 4: Simplify right side
    253.21x = 73,985.81
  5. Step 5: Solve for x
    x = 73,985.81/253.21
  6. Step 6: Final answer
    x = 292.19

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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.