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Finding the Fourth Proportional to 1,318.62, 1,817.94 and 1,081.68

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Solution

The fourth proportional to 1,318.62, 1,817.94 and 1,081.68 is: 1,491.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.62 : 1,817.94 = 1,081.68 : x
  2. Step 2: Convert to fraction form
    1,318.62/1,817.94 = 1,081.68/x
  3. Step 3: Cross multiply
    1,318.62x = 1,817.94 × 1,081.68
  4. Step 4: Simplify right side
    1,318.62x = 1,966,429.34
  5. Step 5: Solve for x
    x = 1,966,429.34/1,318.62
  6. Step 6: Final answer
    x = 1,491.28

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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.