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Finding the Fourth Proportional to 1,219.78, 1,683.30 and 695.80

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Solution

The fourth proportional to 1,219.78, 1,683.30 and 695.80 is: 960.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.78 : 1,683.30 = 695.80 : x
  2. Step 2: Convert to fraction form
    1,219.78/1,683.30 = 695.80/x
  3. Step 3: Cross multiply
    1,219.78x = 1,683.30 × 695.80
  4. Step 4: Simplify right side
    1,219.78x = 1,171,240.14
  5. Step 5: Solve for x
    x = 1,171,240.14/1,219.78
  6. Step 6: Final answer
    x = 960.21

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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.