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Finding the Fourth Proportional to 251.98, 347.72 and 153.74

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Solution

The fourth proportional to 251.98, 347.72 and 153.74 is: 212.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.98 : 347.72 = 153.74 : x
  2. Step 2: Convert to fraction form
    251.98/347.72 = 153.74/x
  3. Step 3: Cross multiply
    251.98x = 347.72 × 153.74
  4. Step 4: Simplify right side
    251.98x = 53,458.47
  5. Step 5: Solve for x
    x = 53,458.47/251.98
  6. Step 6: Final answer
    x = 212.15

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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.