Home / 3,420.40-4,720.60-1,928.78

Finding the Fourth Proportional to 3,420.40, 4,720.60 and 1,928.78

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Solution

The fourth proportional to 3,420.40, 4,720.60 and 1,928.78 is: 2,661.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.40 : 4,720.60 = 1,928.78 : x
  2. Step 2: Convert to fraction form
    3,420.40/4,720.60 = 1,928.78/x
  3. Step 3: Cross multiply
    3,420.40x = 4,720.60 × 1,928.78
  4. Step 4: Simplify right side
    3,420.40x = 9,105,011.08
  5. Step 5: Solve for x
    x = 9,105,011.08/3,420.40
  6. Step 6: Final answer
    x = 2,661.97

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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.