Home / 4,780.80-7,171.20-3,138.30

Finding the Fourth Proportional to 4,780.80, 7,171.20 and 3,138.30

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Solution

The fourth proportional to 4,780.80, 7,171.20 and 3,138.30 is: 4,707.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,780.80 : 7,171.20 = 3,138.30 : x
  2. Step 2: Convert to fraction form
    4,780.80/7,171.20 = 3,138.30/x
  3. Step 3: Cross multiply
    4,780.80x = 7,171.20 × 3,138.30
  4. Step 4: Simplify right side
    4,780.80x = 22,505,376.96
  5. Step 5: Solve for x
    x = 22,505,376.96/4,780.80
  6. Step 6: Final answer
    x = 4,707.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.