Home / 1,285.32-1,928.46-668.72

Finding the Fourth Proportional to 1,285.32, 1,928.46 and 668.72

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Solution

The fourth proportional to 1,285.32, 1,928.46 and 668.72 is: 1,003.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.32 : 1,928.46 = 668.72 : x
  2. Step 2: Convert to fraction form
    1,285.32/1,928.46 = 668.72/x
  3. Step 3: Cross multiply
    1,285.32x = 1,928.46 × 668.72
  4. Step 4: Simplify right side
    1,285.32x = 1,289,599.77
  5. Step 5: Solve for x
    x = 1,289,599.77/1,285.32
  6. Step 6: Final answer
    x = 1,003.33

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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.