Home / 1,391.12-1,919.16-1,180.40

Finding the Fourth Proportional to 1,391.12, 1,919.16 and 1,180.40

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Solution

The fourth proportional to 1,391.12, 1,919.16 and 1,180.40 is: 1,628.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.12 : 1,919.16 = 1,180.40 : x
  2. Step 2: Convert to fraction form
    1,391.12/1,919.16 = 1,180.40/x
  3. Step 3: Cross multiply
    1,391.12x = 1,919.16 × 1,180.40
  4. Step 4: Simplify right side
    1,391.12x = 2,265,376.46
  5. Step 5: Solve for x
    x = 2,265,376.46/1,391.12
  6. Step 6: Final answer
    x = 1,628.46

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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.