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Finding the Fourth Proportional to 3,320.94, 4,981.23 and 855.88

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Solution

The fourth proportional to 3,320.94, 4,981.23 and 855.88 is: 1,283.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.94 : 4,981.23 = 855.88 : x
  2. Step 2: Convert to fraction form
    3,320.94/4,981.23 = 855.88/x
  3. Step 3: Cross multiply
    3,320.94x = 4,981.23 × 855.88
  4. Step 4: Simplify right side
    3,320.94x = 4,263,335.13
  5. Step 5: Solve for x
    x = 4,263,335.13/3,320.94
  6. Step 6: Final answer
    x = 1,283.77

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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.