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Finding the Fourth Proportional to 2,117.70, 2,922.42 and 1,221.44

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Solution

The fourth proportional to 2,117.70, 2,922.42 and 1,221.44 is: 1,685.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.70 : 2,922.42 = 1,221.44 : x
  2. Step 2: Convert to fraction form
    2,117.70/2,922.42 = 1,221.44/x
  3. Step 3: Cross multiply
    2,117.70x = 2,922.42 × 1,221.44
  4. Step 4: Simplify right side
    2,117.70x = 3,569,560.68
  5. Step 5: Solve for x
    x = 3,569,560.68/2,117.70
  6. Step 6: Final answer
    x = 1,685.58

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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.