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Finding the Fourth Proportional to 3,179.78, 4,770.22 and 988.72

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Solution

The fourth proportional to 3,179.78, 4,770.22 and 988.72 is: 1,483.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,179.78 : 4,770.22 = 988.72 : x
  2. Step 2: Convert to fraction form
    3,179.78/4,770.22 = 988.72/x
  3. Step 3: Cross multiply
    3,179.78x = 4,770.22 × 988.72
  4. Step 4: Simplify right side
    3,179.78x = 4,716,411.92
  5. Step 5: Solve for x
    x = 4,716,411.92/3,179.78
  6. Step 6: Final answer
    x = 1,483.25

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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.