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Finding the Fourth Proportional to 2,129.99, 2,939.74 and 1,245.60

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Solution

The fourth proportional to 2,129.99, 2,939.74 and 1,245.60 is: 1,719.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.99 : 2,939.74 = 1,245.60 : x
  2. Step 2: Convert to fraction form
    2,129.99/2,939.74 = 1,245.60/x
  3. Step 3: Cross multiply
    2,129.99x = 2,939.74 × 1,245.60
  4. Step 4: Simplify right side
    2,129.99x = 3,661,737.03
  5. Step 5: Solve for x
    x = 3,661,737.03/2,129.99
  6. Step 6: Final answer
    x = 1,719.14

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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.