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Finding the Fourth Proportional to 3,361.78, 4,639.20 and 1,869.51

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Solution

The fourth proportional to 3,361.78, 4,639.20 and 1,869.51 is: 2,579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,361.78 : 4,639.20 = 1,869.51 : x
  2. Step 2: Convert to fraction form
    3,361.78/4,639.20 = 1,869.51/x
  3. Step 3: Cross multiply
    3,361.78x = 4,639.20 × 1,869.51
  4. Step 4: Simplify right side
    3,361.78x = 8,673,030.79
  5. Step 5: Solve for x
    x = 8,673,030.79/3,361.78
  6. Step 6: Final answer
    x = 2,579.89

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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.