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Finding the Fourth Proportional to 3,318.62, 4,977.88 and 1,128.87

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Solution

The fourth proportional to 3,318.62, 4,977.88 and 1,128.87 is: 1,693.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,318.62 : 4,977.88 = 1,128.87 : x
  2. Step 2: Convert to fraction form
    3,318.62/4,977.88 = 1,128.87/x
  3. Step 3: Cross multiply
    3,318.62x = 4,977.88 × 1,128.87
  4. Step 4: Simplify right side
    3,318.62x = 5,619,376.57
  5. Step 5: Solve for x
    x = 5,619,376.57/3,318.62
  6. Step 6: Final answer
    x = 1,693.29

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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.