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Finding the Fourth Proportional to 2,085.99, 3,129.23 and 990.09

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Solution

The fourth proportional to 2,085.99, 3,129.23 and 990.09 is: 1,485.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.99 : 3,129.23 = 990.09 : x
  2. Step 2: Convert to fraction form
    2,085.99/3,129.23 = 990.09/x
  3. Step 3: Cross multiply
    2,085.99x = 3,129.23 × 990.09
  4. Step 4: Simplify right side
    2,085.99x = 3,098,221.81
  5. Step 5: Solve for x
    x = 3,098,221.81/2,085.99
  6. Step 6: Final answer
    x = 1,485.26

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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.