Home / 2,389.64-3,285.78-2,039.72

Finding the Fourth Proportional to 2,389.64, 3,285.78 and 2,039.72

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Solution

The fourth proportional to 2,389.64, 3,285.78 and 2,039.72 is: 2,804.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,389.64 : 3,285.78 = 2,039.72 : x
  2. Step 2: Convert to fraction form
    2,389.64/3,285.78 = 2,039.72/x
  3. Step 3: Cross multiply
    2,389.64x = 3,285.78 × 2,039.72
  4. Step 4: Simplify right side
    2,389.64x = 6,702,071.18
  5. Step 5: Solve for x
    x = 6,702,071.18/2,389.64
  6. Step 6: Final answer
    x = 2,804.64

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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.