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Finding the Fourth Proportional to 1,919.95, 2,880.32 and 621.31

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Solution

The fourth proportional to 1,919.95, 2,880.32 and 621.31 is: 932.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.95 : 2,880.32 = 621.31 : x
  2. Step 2: Convert to fraction form
    1,919.95/2,880.32 = 621.31/x
  3. Step 3: Cross multiply
    1,919.95x = 2,880.32 × 621.31
  4. Step 4: Simplify right side
    1,919.95x = 1,789,571.62
  5. Step 5: Solve for x
    x = 1,789,571.62/1,919.95
  6. Step 6: Final answer
    x = 932.09

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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.