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Finding the Fourth Proportional to 253.11, 349.70 and 211.53

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Solution

The fourth proportional to 253.11, 349.70 and 211.53 is: 292.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.11 : 349.70 = 211.53 : x
  2. Step 2: Convert to fraction form
    253.11/349.70 = 211.53/x
  3. Step 3: Cross multiply
    253.11x = 349.70 × 211.53
  4. Step 4: Simplify right side
    253.11x = 73,970.98
  5. Step 5: Solve for x
    x = 73,970.98/253.11
  6. Step 6: Final answer
    x = 292.25

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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.