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Finding the Fourth Proportional to 251.56, 347.08 and 172.72

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Solution

The fourth proportional to 251.56, 347.08 and 172.72 is: 238.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.56 : 347.08 = 172.72 : x
  2. Step 2: Convert to fraction form
    251.56/347.08 = 172.72/x
  3. Step 3: Cross multiply
    251.56x = 347.08 × 172.72
  4. Step 4: Simplify right side
    251.56x = 59,947.66
  5. Step 5: Solve for x
    x = 59,947.66/251.56
  6. Step 6: Final answer
    x = 238.30

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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.