Home / 3,928.08-5,420.79-2,159.65

Finding the Fourth Proportional to 3,928.08, 5,420.79 and 2,159.65

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Solution

The fourth proportional to 3,928.08, 5,420.79 and 2,159.65 is: 2,980.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.08 : 5,420.79 = 2,159.65 : x
  2. Step 2: Convert to fraction form
    3,928.08/5,420.79 = 2,159.65/x
  3. Step 3: Cross multiply
    3,928.08x = 5,420.79 × 2,159.65
  4. Step 4: Simplify right side
    3,928.08x = 11,707,009.12
  5. Step 5: Solve for x
    x = 11,707,009.12/3,928.08
  6. Step 6: Final answer
    x = 2,980.34

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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.