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Finding the Fourth Proportional to 1,220, 1,683.72 and 696.04

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Solution

The fourth proportional to 1,220, 1,683.72 and 696.04 is: 960.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220 : 1,683.72 = 696.04 : x
  2. Step 2: Convert to fraction form
    1,220/1,683.72 = 696.04/x
  3. Step 3: Cross multiply
    1,220x = 1,683.72 × 696.04
  4. Step 4: Simplify right side
    1,220x = 1,171,936.47
  5. Step 5: Solve for x
    x = 1,171,936.47/1,220
  6. Step 6: Final answer
    x = 960.60

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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.