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Finding the Fourth Proportional to 3,620.88, 4,999.62 and 2,780.22

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Solution

The fourth proportional to 3,620.88, 4,999.62 and 2,780.22 is: 3,838.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,620.88 : 4,999.62 = 2,780.22 : x
  2. Step 2: Convert to fraction form
    3,620.88/4,999.62 = 2,780.22/x
  3. Step 3: Cross multiply
    3,620.88x = 4,999.62 × 2,780.22
  4. Step 4: Simplify right side
    3,620.88x = 13,900,043.52
  5. Step 5: Solve for x
    x = 13,900,043.52/3,620.88
  6. Step 6: Final answer
    x = 3,838.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.