Home / 3,928.56-5,421.47-2,136.06

Finding the Fourth Proportional to 3,928.56, 5,421.47 and 2,136.06

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Solution

The fourth proportional to 3,928.56, 5,421.47 and 2,136.06 is: 2,947.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.56 : 5,421.47 = 2,136.06 : x
  2. Step 2: Convert to fraction form
    3,928.56/5,421.47 = 2,136.06/x
  3. Step 3: Cross multiply
    3,928.56x = 5,421.47 × 2,136.06
  4. Step 4: Simplify right side
    3,928.56x = 11,580,574.53
  5. Step 5: Solve for x
    x = 11,580,574.53/3,928.56
  6. Step 6: Final answer
    x = 2,947.79

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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.