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Finding the Fourth Proportional to 2,144.47, 3,216.65 and 990.22

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Solution

The fourth proportional to 2,144.47, 3,216.65 and 990.22 is: 1,485.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,144.47 : 3,216.65 = 990.22 : x
  2. Step 2: Convert to fraction form
    2,144.47/3,216.65 = 990.22/x
  3. Step 3: Cross multiply
    2,144.47x = 3,216.65 × 990.22
  4. Step 4: Simplify right side
    2,144.47x = 3,185,191.16
  5. Step 5: Solve for x
    x = 3,185,191.16/2,144.47
  6. Step 6: Final answer
    x = 1,485.30

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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.