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Finding the Fourth Proportional to 1,078.92, 1,486.70 and 999.19

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Solution

The fourth proportional to 1,078.92, 1,486.70 and 999.19 is: 1,376.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.92 : 1,486.70 = 999.19 : x
  2. Step 2: Convert to fraction form
    1,078.92/1,486.70 = 999.19/x
  3. Step 3: Cross multiply
    1,078.92x = 1,486.70 × 999.19
  4. Step 4: Simplify right side
    1,078.92x = 1,485,493.64
  5. Step 5: Solve for x
    x = 1,485,493.64/1,078.92
  6. Step 6: Final answer
    x = 1,376.83

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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.