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Finding the Fourth Proportional to 2,653, 3,980.96 and 1,285

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Solution

The fourth proportional to 2,653, 3,980.96 and 1,285 is: 1,928.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,653 : 3,980.96 = 1,285 : x
  2. Step 2: Convert to fraction form
    2,653/3,980.96 = 1,285/x
  3. Step 3: Cross multiply
    2,653x = 3,980.96 × 1,285
  4. Step 4: Simplify right side
    2,653x = 5,115,533.60
  5. Step 5: Solve for x
    x = 5,115,533.60/2,653
  6. Step 6: Final answer
    x = 1,928.21

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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.