Home / 2,142.96-3,213.60-1,320

Finding the Fourth Proportional to 2,142.96, 3,213.60 and 1,320

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Solution

The fourth proportional to 2,142.96, 3,213.60 and 1,320 is: 1,979.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.96 : 3,213.60 = 1,320 : x
  2. Step 2: Convert to fraction form
    2,142.96/3,213.60 = 1,320/x
  3. Step 3: Cross multiply
    2,142.96x = 3,213.60 × 1,320
  4. Step 4: Simplify right side
    2,142.96x = 4,241,952
  5. Step 5: Solve for x
    x = 4,241,952/2,142.96
  6. Step 6: Final answer
    x = 1,979.48

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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.