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Finding the Fourth Proportional to 1,220.19, 1,683.90 and 696.39

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Solution

The fourth proportional to 1,220.19, 1,683.90 and 696.39 is: 961.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.19 : 1,683.90 = 696.39 : x
  2. Step 2: Convert to fraction form
    1,220.19/1,683.90 = 696.39/x
  3. Step 3: Cross multiply
    1,220.19x = 1,683.90 × 696.39
  4. Step 4: Simplify right side
    1,220.19x = 1,172,651.12
  5. Step 5: Solve for x
    x = 1,172,651.12/1,220.19
  6. Step 6: Final answer
    x = 961.04

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1.5x scale

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.