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Finding the Fourth Proportional to 2,143.77, 2,958.54 and 1,247.79

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Solution

The fourth proportional to 2,143.77, 2,958.54 and 1,247.79 is: 1,722.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.77 : 2,958.54 = 1,247.79 : x
  2. Step 2: Convert to fraction form
    2,143.77/2,958.54 = 1,247.79/x
  3. Step 3: Cross multiply
    2,143.77x = 2,958.54 × 1,247.79
  4. Step 4: Simplify right side
    2,143.77x = 3,691,636.63
  5. Step 5: Solve for x
    x = 3,691,636.63/2,143.77
  6. Step 6: Final answer
    x = 1,722.03

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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.