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Finding the Fourth Proportional to 3,890.55, 5,368.90 and 2,122.16

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Solution

The fourth proportional to 3,890.55, 5,368.90 and 2,122.16 is: 2,928.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.55 : 5,368.90 = 2,122.16 : x
  2. Step 2: Convert to fraction form
    3,890.55/5,368.90 = 2,122.16/x
  3. Step 3: Cross multiply
    3,890.55x = 5,368.90 × 2,122.16
  4. Step 4: Simplify right side
    3,890.55x = 11,393,627.37
  5. Step 5: Solve for x
    x = 11,393,627.37/3,890.55
  6. Step 6: Final answer
    x = 2,928.54

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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.