Home / 3,139.11-4,709.42-947.70

Finding the Fourth Proportional to 3,139.11, 4,709.42 and 947.70

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Solution

The fourth proportional to 3,139.11, 4,709.42 and 947.70 is: 1,421.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.11 : 4,709.42 = 947.70 : x
  2. Step 2: Convert to fraction form
    3,139.11/4,709.42 = 947.70/x
  3. Step 3: Cross multiply
    3,139.11x = 4,709.42 × 947.70
  4. Step 4: Simplify right side
    3,139.11x = 4,463,112.60
  5. Step 5: Solve for x
    x = 4,463,112.60/3,139.11
  6. Step 6: Final answer
    x = 1,421.78

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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.