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Finding the Fourth Proportional to 3,320.70, 4,981.35 and 855.53

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Solution

The fourth proportional to 3,320.70, 4,981.35 and 855.53 is: 1,283.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.70 : 4,981.35 = 855.53 : x
  2. Step 2: Convert to fraction form
    3,320.70/4,981.35 = 855.53/x
  3. Step 3: Cross multiply
    3,320.70x = 4,981.35 × 855.53
  4. Step 4: Simplify right side
    3,320.70x = 4,261,669.46
  5. Step 5: Solve for x
    x = 4,261,669.46/3,320.70
  6. Step 6: Final answer
    x = 1,283.37

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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.