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Finding the Fourth Proportional to 251.61, 347.20 and 153.37

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Solution

The fourth proportional to 251.61, 347.20 and 153.37 is: 211.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.61 : 347.20 = 153.37 : x
  2. Step 2: Convert to fraction form
    251.61/347.20 = 153.37/x
  3. Step 3: Cross multiply
    251.61x = 347.20 × 153.37
  4. Step 4: Simplify right side
    251.61x = 53,250.06
  5. Step 5: Solve for x
    x = 53,250.06/251.61
  6. Step 6: Final answer
    x = 211.64

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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.