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Finding the Fourth Proportional to 3,320.90, 4,981.64 and 855.70

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Solution

The fourth proportional to 3,320.90, 4,981.64 and 855.70 is: 1,283.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.90 : 4,981.64 = 855.70 : x
  2. Step 2: Convert to fraction form
    3,320.90/4,981.64 = 855.70/x
  3. Step 3: Cross multiply
    3,320.90x = 4,981.64 × 855.70
  4. Step 4: Simplify right side
    3,320.90x = 4,262,772.62
  5. Step 5: Solve for x
    x = 4,262,772.62/3,320.90
  6. Step 6: Final answer
    x = 1,283.62

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1.5x scale

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.