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Finding the Fourth Proportional to 1,919.95, 2,880.39 and 621.42

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Solution

The fourth proportional to 1,919.95, 2,880.39 and 621.42 is: 932.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.95 : 2,880.39 = 621.42 : x
  2. Step 2: Convert to fraction form
    1,919.95/2,880.39 = 621.42/x
  3. Step 3: Cross multiply
    1,919.95x = 2,880.39 × 621.42
  4. Step 4: Simplify right side
    1,919.95x = 1,789,934.44
  5. Step 5: Solve for x
    x = 1,789,934.44/1,919.95
  6. Step 6: Final answer
    x = 932.28

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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.