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Finding the Fourth Proportional to 3,320.28, 4,980.30 and 855

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Solution

The fourth proportional to 3,320.28, 4,980.30 and 855 is: 1,282.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.28 : 4,980.30 = 855 : x
  2. Step 2: Convert to fraction form
    3,320.28/4,980.30 = 855/x
  3. Step 3: Cross multiply
    3,320.28x = 4,980.30 × 855
  4. Step 4: Simplify right side
    3,320.28x = 4,258,156.50
  5. Step 5: Solve for x
    x = 4,258,156.50/3,320.28
  6. Step 6: Final answer
    x = 1,282.47

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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.