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Finding the Fourth Proportional to 2,478.36, 3,719.40 and 919.80

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Solution

The fourth proportional to 2,478.36, 3,719.40 and 919.80 is: 1,380.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,478.36 : 3,719.40 = 919.80 : x
  2. Step 2: Convert to fraction form
    2,478.36/3,719.40 = 919.80/x
  3. Step 3: Cross multiply
    2,478.36x = 3,719.40 × 919.80
  4. Step 4: Simplify right side
    2,478.36x = 3,421,104.12
  5. Step 5: Solve for x
    x = 3,421,104.12/2,478.36
  6. Step 6: Final answer
    x = 1,380.39

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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.