Home / 1,920.12-2,880.90-1,376.64

Finding the Fourth Proportional to 1,920.12, 2,880.90 and 1,376.64

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Solution

The fourth proportional to 1,920.12, 2,880.90 and 1,376.64 is: 2,065.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.12 : 2,880.90 = 1,376.64 : x
  2. Step 2: Convert to fraction form
    1,920.12/2,880.90 = 1,376.64/x
  3. Step 3: Cross multiply
    1,920.12x = 2,880.90 × 1,376.64
  4. Step 4: Simplify right side
    1,920.12x = 3,965,962.18
  5. Step 5: Solve for x
    x = 3,965,962.18/1,920.12
  6. Step 6: Final answer
    x = 2,065.48

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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.