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Finding the Fourth Proportional to 3,178.64, 4,768.22 and 838.62

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Solution

The fourth proportional to 3,178.64, 4,768.22 and 838.62 is: 1,258.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.64 : 4,768.22 = 838.62 : x
  2. Step 2: Convert to fraction form
    3,178.64/4,768.22 = 838.62/x
  3. Step 3: Cross multiply
    3,178.64x = 4,768.22 × 838.62
  4. Step 4: Simplify right side
    3,178.64x = 3,998,726.75
  5. Step 5: Solve for x
    x = 3,998,726.75/3,178.64
  6. Step 6: Final answer
    x = 1,258.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.