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Finding the Fourth Proportional to 251.84, 347.35 and 212.72

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Solution

The fourth proportional to 251.84, 347.35 and 212.72 is: 293.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.84 : 347.35 = 212.72 : x
  2. Step 2: Convert to fraction form
    251.84/347.35 = 212.72/x
  3. Step 3: Cross multiply
    251.84x = 347.35 × 212.72
  4. Step 4: Simplify right side
    251.84x = 73,888.29
  5. Step 5: Solve for x
    x = 73,888.29/251.84
  6. Step 6: Final answer
    x = 293.39

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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.