Home / 3,111.02-4,293.65-1,991.60

Finding the Fourth Proportional to 3,111.02, 4,293.65 and 1,991.60

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Solution

The fourth proportional to 3,111.02, 4,293.65 and 1,991.60 is: 2,748.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.02 : 4,293.65 = 1,991.60 : x
  2. Step 2: Convert to fraction form
    3,111.02/4,293.65 = 1,991.60/x
  3. Step 3: Cross multiply
    3,111.02x = 4,293.65 × 1,991.60
  4. Step 4: Simplify right side
    3,111.02x = 8,551,233.34
  5. Step 5: Solve for x
    x = 8,551,233.34/3,111.02
  6. Step 6: Final answer
    x = 2,748.69

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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.