Home / 1,639.26-2,459.85-1,128.54

Finding the Fourth Proportional to 1,639.26, 2,459.85 and 1,128.54

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Solution

The fourth proportional to 1,639.26, 2,459.85 and 1,128.54 is: 1,693.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.26 : 2,459.85 = 1,128.54 : x
  2. Step 2: Convert to fraction form
    1,639.26/2,459.85 = 1,128.54/x
  3. Step 3: Cross multiply
    1,639.26x = 2,459.85 × 1,128.54
  4. Step 4: Simplify right side
    1,639.26x = 2,776,039.12
  5. Step 5: Solve for x
    x = 2,776,039.12/1,639.26
  6. Step 6: Final answer
    x = 1,693.47

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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.