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Finding the Fourth Proportional to 2,155.78, 3,217 and 1,922.80

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Solution

The fourth proportional to 2,155.78, 3,217 and 1,922.80 is: 2,869.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.78 : 3,217 = 1,922.80 : x
  2. Step 2: Convert to fraction form
    2,155.78/3,217 = 1,922.80/x
  3. Step 3: Cross multiply
    2,155.78x = 3,217 × 1,922.80
  4. Step 4: Simplify right side
    2,155.78x = 6,185,647.60
  5. Step 5: Solve for x
    x = 6,185,647.60/2,155.78
  6. Step 6: Final answer
    x = 2,869.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.