Home / 5,455.28-8,181.36-1,991.72

Finding the Fourth Proportional to 5,455.28, 8,181.36 and 1,991.72

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Solution

The fourth proportional to 5,455.28, 8,181.36 and 1,991.72 is: 2,987.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,455.28 : 8,181.36 = 1,991.72 : x
  2. Step 2: Convert to fraction form
    5,455.28/8,181.36 = 1,991.72/x
  3. Step 3: Cross multiply
    5,455.28x = 8,181.36 × 1,991.72
  4. Step 4: Simplify right side
    5,455.28x = 16,294,978.34
  5. Step 5: Solve for x
    x = 16,294,978.34/5,455.28
  6. Step 6: Final answer
    x = 2,987.01

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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.