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Finding the Fourth Proportional to 1,219.95, 1,683.83 and 696.28

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Solution

The fourth proportional to 1,219.95, 1,683.83 and 696.28 is: 961.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.95 : 1,683.83 = 696.28 : x
  2. Step 2: Convert to fraction form
    1,219.95/1,683.83 = 696.28/x
  3. Step 3: Cross multiply
    1,219.95x = 1,683.83 × 696.28
  4. Step 4: Simplify right side
    1,219.95x = 1,172,417.15
  5. Step 5: Solve for x
    x = 1,172,417.15/1,219.95
  6. Step 6: Final answer
    x = 961.04

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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.