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Finding the Fourth Proportional to 1,940.83, 2,911.21 and 479.98

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Solution

The fourth proportional to 1,940.83, 2,911.21 and 479.98 is: 719.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.83 : 2,911.21 = 479.98 : x
  2. Step 2: Convert to fraction form
    1,940.83/2,911.21 = 479.98/x
  3. Step 3: Cross multiply
    1,940.83x = 2,911.21 × 479.98
  4. Step 4: Simplify right side
    1,940.83x = 1,397,322.58
  5. Step 5: Solve for x
    x = 1,397,322.58/1,940.83
  6. Step 6: Final answer
    x = 719.96

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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.