Home / 1,390.12-2,083.37-1,040.71

Finding the Fourth Proportional to 1,390.12, 2,083.37 and 1,040.71

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Solution

The fourth proportional to 1,390.12, 2,083.37 and 1,040.71 is: 1,559.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.12 : 2,083.37 = 1,040.71 : x
  2. Step 2: Convert to fraction form
    1,390.12/2,083.37 = 1,040.71/x
  3. Step 3: Cross multiply
    1,390.12x = 2,083.37 × 1,040.71
  4. Step 4: Simplify right side
    1,390.12x = 2,168,168.37
  5. Step 5: Solve for x
    x = 2,168,168.37/1,390.12
  6. Step 6: Final answer
    x = 1,559.70

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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.