Home / 3,928.72-5,421.42-2,160.04

Finding the Fourth Proportional to 3,928.72, 5,421.42 and 2,160.04

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Solution

The fourth proportional to 3,928.72, 5,421.42 and 2,160.04 is: 2,980.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.72 : 5,421.42 = 2,160.04 : x
  2. Step 2: Convert to fraction form
    3,928.72/5,421.42 = 2,160.04/x
  3. Step 3: Cross multiply
    3,928.72x = 5,421.42 × 2,160.04
  4. Step 4: Simplify right side
    3,928.72x = 11,710,484.06
  5. Step 5: Solve for x
    x = 11,710,484.06/3,928.72
  6. Step 6: Final answer
    x = 2,980.74

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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.