Home / 3,928.78-5,421.87-2,160.35

Finding the Fourth Proportional to 3,928.78, 5,421.87 and 2,160.35

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Solution

The fourth proportional to 3,928.78, 5,421.87 and 2,160.35 is: 2,981.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.78 : 5,421.87 = 2,160.35 : x
  2. Step 2: Convert to fraction form
    3,928.78/5,421.87 = 2,160.35/x
  3. Step 3: Cross multiply
    3,928.78x = 5,421.87 × 2,160.35
  4. Step 4: Simplify right side
    3,928.78x = 11,713,130.08
  5. Step 5: Solve for x
    x = 11,713,130.08/3,928.78
  6. Step 6: Final answer
    x = 2,981.36

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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.