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Finding the Fourth Proportional to 3,179.74, 4,768.20 and 988.28

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Solution

The fourth proportional to 3,179.74, 4,768.20 and 988.28 is: 1,481.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,179.74 : 4,768.20 = 988.28 : x
  2. Step 2: Convert to fraction form
    3,179.74/4,768.20 = 988.28/x
  3. Step 3: Cross multiply
    3,179.74x = 4,768.20 × 988.28
  4. Step 4: Simplify right side
    3,179.74x = 4,712,316.70
  5. Step 5: Solve for x
    x = 4,712,316.70/3,179.74
  6. Step 6: Final answer
    x = 1,481.98

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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.