Home / 1,292.39-1,940.56-1,139.60

Finding the Fourth Proportional to 1,292.39, 1,940.56 and 1,139.60

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Solution

The fourth proportional to 1,292.39, 1,940.56 and 1,139.60 is: 1,711.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.39 : 1,940.56 = 1,139.60 : x
  2. Step 2: Convert to fraction form
    1,292.39/1,940.56 = 1,139.60/x
  3. Step 3: Cross multiply
    1,292.39x = 1,940.56 × 1,139.60
  4. Step 4: Simplify right side
    1,292.39x = 2,211,464.18
  5. Step 5: Solve for x
    x = 2,211,464.18/1,292.39
  6. Step 6: Final answer
    x = 1,711.14

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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.