Home / 5,111.88-7,666.08-1,991.64

Finding the Fourth Proportional to 5,111.88, 7,666.08 and 1,991.64

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Solution

The fourth proportional to 5,111.88, 7,666.08 and 1,991.64 is: 2,986.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,111.88 : 7,666.08 = 1,991.64 : x
  2. Step 2: Convert to fraction form
    5,111.88/7,666.08 = 1,991.64/x
  3. Step 3: Cross multiply
    5,111.88x = 7,666.08 × 1,991.64
  4. Step 4: Simplify right side
    5,111.88x = 15,268,071.57
  5. Step 5: Solve for x
    x = 15,268,071.57/5,111.88
  6. Step 6: Final answer
    x = 2,986.78

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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.