Home / 5,213.78-7,820.40-1,318.22

Finding the Fourth Proportional to 5,213.78, 7,820.40 and 1,318.22

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Solution

The fourth proportional to 5,213.78, 7,820.40 and 1,318.22 is: 1,977.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,213.78 : 7,820.40 = 1,318.22 : x
  2. Step 2: Convert to fraction form
    5,213.78/7,820.40 = 1,318.22/x
  3. Step 3: Cross multiply
    5,213.78x = 7,820.40 × 1,318.22
  4. Step 4: Simplify right side
    5,213.78x = 10,309,007.69
  5. Step 5: Solve for x
    x = 10,309,007.69/5,213.78
  6. Step 6: Final answer
    x = 1,977.26

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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.