Home / 1,947.81-2,918.37-1,289.28

Finding the Fourth Proportional to 1,947.81, 2,918.37 and 1,289.28

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Solution

The fourth proportional to 1,947.81, 2,918.37 and 1,289.28 is: 1,931.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.81 : 2,918.37 = 1,289.28 : x
  2. Step 2: Convert to fraction form
    1,947.81/2,918.37 = 1,289.28/x
  3. Step 3: Cross multiply
    1,947.81x = 2,918.37 × 1,289.28
  4. Step 4: Simplify right side
    1,947.81x = 3,762,596.07
  5. Step 5: Solve for x
    x = 3,762,596.07/1,947.81
  6. Step 6: Final answer
    x = 1,931.71

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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.