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Finding the Fourth Proportional to 1,214.10, 1,819.80 and 694.35

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Solution

The fourth proportional to 1,214.10, 1,819.80 and 694.35 is: 1,040.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.10 : 1,819.80 = 694.35 : x
  2. Step 2: Convert to fraction form
    1,214.10/1,819.80 = 694.35/x
  3. Step 3: Cross multiply
    1,214.10x = 1,819.80 × 694.35
  4. Step 4: Simplify right side
    1,214.10x = 1,263,578.13
  5. Step 5: Solve for x
    x = 1,263,578.13/1,214.10
  6. Step 6: Final answer
    x = 1,040.75

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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.