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Finding the Fourth Proportional to 1,119.10, 1,678.92 and 679.54

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Solution

The fourth proportional to 1,119.10, 1,678.92 and 679.54 is: 1,019.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.10 : 1,678.92 = 679.54 : x
  2. Step 2: Convert to fraction form
    1,119.10/1,678.92 = 679.54/x
  3. Step 3: Cross multiply
    1,119.10x = 1,678.92 × 679.54
  4. Step 4: Simplify right side
    1,119.10x = 1,140,893.30
  5. Step 5: Solve for x
    x = 1,140,893.30/1,119.10
  6. Step 6: Final answer
    x = 1,019.47

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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.