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Finding the Fourth Proportional to 3,139.66, 4,709.90 and 1,290.63

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Solution

The fourth proportional to 3,139.66, 4,709.90 and 1,290.63 is: 1,936.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.66 : 4,709.90 = 1,290.63 : x
  2. Step 2: Convert to fraction form
    3,139.66/4,709.90 = 1,290.63/x
  3. Step 3: Cross multiply
    3,139.66x = 4,709.90 × 1,290.63
  4. Step 4: Simplify right side
    3,139.66x = 6,078,751.87
  5. Step 5: Solve for x
    x = 6,078,751.87/3,139.66
  6. Step 6: Final answer
    x = 1,936.12

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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.