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Finding the Fourth Proportional to 1,919.68, 2,879.52 and 621.40

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Solution

The fourth proportional to 1,919.68, 2,879.52 and 621.40 is: 932.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.68 : 2,879.52 = 621.40 : x
  2. Step 2: Convert to fraction form
    1,919.68/2,879.52 = 621.40/x
  3. Step 3: Cross multiply
    1,919.68x = 2,879.52 × 621.40
  4. Step 4: Simplify right side
    1,919.68x = 1,789,333.73
  5. Step 5: Solve for x
    x = 1,789,333.73/1,919.68
  6. Step 6: Final answer
    x = 932.10

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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.