Home / 3,890.18-5,368.46-2,121.80

Finding the Fourth Proportional to 3,890.18, 5,368.46 and 2,121.80

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Solution

The fourth proportional to 3,890.18, 5,368.46 and 2,121.80 is: 2,928.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.18 : 5,368.46 = 2,121.80 : x
  2. Step 2: Convert to fraction form
    3,890.18/5,368.46 = 2,121.80/x
  3. Step 3: Cross multiply
    3,890.18x = 5,368.46 × 2,121.80
  4. Step 4: Simplify right side
    3,890.18x = 11,390,760.98
  5. Step 5: Solve for x
    x = 11,390,760.98/3,890.18
  6. Step 6: Final answer
    x = 2,928.08

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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.