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Finding the Fourth Proportional to 1,220.43, 1,684.19 and 696.47

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Solution

The fourth proportional to 1,220.43, 1,684.19 and 696.47 is: 961.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.43 : 1,684.19 = 696.47 : x
  2. Step 2: Convert to fraction form
    1,220.43/1,684.19 = 696.47/x
  3. Step 3: Cross multiply
    1,220.43x = 1,684.19 × 696.47
  4. Step 4: Simplify right side
    1,220.43x = 1,172,981.13
  5. Step 5: Solve for x
    x = 1,172,981.13/1,220.43
  6. Step 6: Final answer
    x = 961.12

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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.