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Finding the Fourth Proportional to 2,160.80, 3,240.12 and 699.80

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Solution

The fourth proportional to 2,160.80, 3,240.12 and 699.80 is: 1,049.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.80 : 3,240.12 = 699.80 : x
  2. Step 2: Convert to fraction form
    2,160.80/3,240.12 = 699.80/x
  3. Step 3: Cross multiply
    2,160.80x = 3,240.12 × 699.80
  4. Step 4: Simplify right side
    2,160.80x = 2,267,435.98
  5. Step 5: Solve for x
    x = 2,267,435.98/2,160.80
  6. Step 6: Final answer
    x = 1,049.35

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1.5x scale

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.