Home / 3,928.23-5,421.20-2,160

Finding the Fourth Proportional to 3,928.23, 5,421.20 and 2,160

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Solution

The fourth proportional to 3,928.23, 5,421.20 and 2,160 is: 2,980.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.23 : 5,421.20 = 2,160 : x
  2. Step 2: Convert to fraction form
    3,928.23/5,421.20 = 2,160/x
  3. Step 3: Cross multiply
    3,928.23x = 5,421.20 × 2,160
  4. Step 4: Simplify right side
    3,928.23x = 11,709,781.20
  5. Step 5: Solve for x
    x = 11,709,781.20/3,928.23
  6. Step 6: Final answer
    x = 2,980.93

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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.