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Finding the Fourth Proportional to 251.12, 346.55 and 139.08

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Solution

The fourth proportional to 251.12, 346.55 and 139.08 is: 191.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.12 : 346.55 = 139.08 : x
  2. Step 2: Convert to fraction form
    251.12/346.55 = 139.08/x
  3. Step 3: Cross multiply
    251.12x = 346.55 × 139.08
  4. Step 4: Simplify right side
    251.12x = 48,197.48
  5. Step 5: Solve for x
    x = 48,197.48/251.12
  6. Step 6: Final answer
    x = 191.93

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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.