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Finding the Fourth Proportional to 2,479.99, 3,720.01 and 919.39

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Solution

The fourth proportional to 2,479.99, 3,720.01 and 919.39 is: 1,379.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,479.99 : 3,720.01 = 919.39 : x
  2. Step 2: Convert to fraction form
    2,479.99/3,720.01 = 919.39/x
  3. Step 3: Cross multiply
    2,479.99x = 3,720.01 × 919.39
  4. Step 4: Simplify right side
    2,479.99x = 3,420,123.34
  5. Step 5: Solve for x
    x = 3,420,123.34/2,479.99
  6. Step 6: Final answer
    x = 1,379.09

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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.