Home / 5,138.26-7,090.81-2,780.40

Finding the Fourth Proportional to 5,138.26, 7,090.81 and 2,780.40

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Solution

The fourth proportional to 5,138.26, 7,090.81 and 2,780.40 is: 3,836.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.26 : 7,090.81 = 2,780.40 : x
  2. Step 2: Convert to fraction form
    5,138.26/7,090.81 = 2,780.40/x
  3. Step 3: Cross multiply
    5,138.26x = 7,090.81 × 2,780.40
  4. Step 4: Simplify right side
    5,138.26x = 19,715,267.88
  5. Step 5: Solve for x
    x = 19,715,267.88/5,138.26
  6. Step 6: Final answer
    x = 3,836.96

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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.