Home / 1,391.58-1,919.70-1,170.45

Finding the Fourth Proportional to 1,391.58, 1,919.70 and 1,170.45

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Solution

The fourth proportional to 1,391.58, 1,919.70 and 1,170.45 is: 1,614.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.58 : 1,919.70 = 1,170.45 : x
  2. Step 2: Convert to fraction form
    1,391.58/1,919.70 = 1,170.45/x
  3. Step 3: Cross multiply
    1,391.58x = 1,919.70 × 1,170.45
  4. Step 4: Simplify right side
    1,391.58x = 2,246,912.87
  5. Step 5: Solve for x
    x = 2,246,912.87/1,391.58
  6. Step 6: Final answer
    x = 1,614.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.