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Finding the Fourth Proportional to 3,320.74, 4,981.37 and 855.59

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Solution

The fourth proportional to 3,320.74, 4,981.37 and 855.59 is: 1,283.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.74 : 4,981.37 = 855.59 : x
  2. Step 2: Convert to fraction form
    3,320.74/4,981.37 = 855.59/x
  3. Step 3: Cross multiply
    3,320.74x = 4,981.37 × 855.59
  4. Step 4: Simplify right side
    3,320.74x = 4,262,010.36
  5. Step 5: Solve for x
    x = 4,262,010.36/3,320.74
  6. Step 6: Final answer
    x = 1,283.45

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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.