Home / 1,289.19-1,930.70-739.71

Finding the Fourth Proportional to 1,289.19, 1,930.70 and 739.71

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Solution

The fourth proportional to 1,289.19, 1,930.70 and 739.71 is: 1,107.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.19 : 1,930.70 = 739.71 : x
  2. Step 2: Convert to fraction form
    1,289.19/1,930.70 = 739.71/x
  3. Step 3: Cross multiply
    1,289.19x = 1,930.70 × 739.71
  4. Step 4: Simplify right side
    1,289.19x = 1,428,154.40
  5. Step 5: Solve for x
    x = 1,428,154.40/1,289.19
  6. Step 6: Final answer
    x = 1,107.79

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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.