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Finding the Fourth Proportional to 2,199.50, 3,299.39 and 639.51

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Solution

The fourth proportional to 2,199.50, 3,299.39 and 639.51 is: 959.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,199.50 : 3,299.39 = 639.51 : x
  2. Step 2: Convert to fraction form
    2,199.50/3,299.39 = 639.51/x
  3. Step 3: Cross multiply
    2,199.50x = 3,299.39 × 639.51
  4. Step 4: Simplify right side
    2,199.50x = 2,109,994.50
  5. Step 5: Solve for x
    x = 2,109,994.50/2,199.50
  6. Step 6: Final answer
    x = 959.31

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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.