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Finding the Fourth Proportional to 251.79, 347.45 and 139.75

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Solution

The fourth proportional to 251.79, 347.45 and 139.75 is: 192.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.79 : 347.45 = 139.75 : x
  2. Step 2: Convert to fraction form
    251.79/347.45 = 139.75/x
  3. Step 3: Cross multiply
    251.79x = 347.45 × 139.75
  4. Step 4: Simplify right side
    251.79x = 48,556.14
  5. Step 5: Solve for x
    x = 48,556.14/251.79
  6. Step 6: Final answer
    x = 192.84

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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.