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Finding the Fourth Proportional to 251.81, 347.34 and 210.55

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Solution

The fourth proportional to 251.81, 347.34 and 210.55 is: 290.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.81 : 347.34 = 210.55 : x
  2. Step 2: Convert to fraction form
    251.81/347.34 = 210.55/x
  3. Step 3: Cross multiply
    251.81x = 347.34 × 210.55
  4. Step 4: Simplify right side
    251.81x = 73,131.83
  5. Step 5: Solve for x
    x = 73,131.83/251.81
  6. Step 6: Final answer
    x = 290.43

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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.