Home / 1,387.39-2,081.07-1,318.18

Finding the Fourth Proportional to 1,387.39, 2,081.07 and 1,318.18

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Solution

The fourth proportional to 1,387.39, 2,081.07 and 1,318.18 is: 1,977.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.39 : 2,081.07 = 1,318.18 : x
  2. Step 2: Convert to fraction form
    1,387.39/2,081.07 = 1,318.18/x
  3. Step 3: Cross multiply
    1,387.39x = 2,081.07 × 1,318.18
  4. Step 4: Simplify right side
    1,387.39x = 2,743,224.85
  5. Step 5: Solve for x
    x = 2,743,224.85/1,387.39
  6. Step 6: Final answer
    x = 1,977.26

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1.5x scale

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.