Home / 3,890.19-5,368.51-2,121.81

Finding the Fourth Proportional to 3,890.19, 5,368.51 and 2,121.81

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Solution

The fourth proportional to 3,890.19, 5,368.51 and 2,121.81 is: 2,928.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.19 : 5,368.51 = 2,121.81 : x
  2. Step 2: Convert to fraction form
    3,890.19/5,368.51 = 2,121.81/x
  3. Step 3: Cross multiply
    3,890.19x = 5,368.51 × 2,121.81
  4. Step 4: Simplify right side
    3,890.19x = 11,390,958.20
  5. Step 5: Solve for x
    x = 11,390,958.20/3,890.19
  6. Step 6: Final answer
    x = 2,928.12

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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.