Home / 2,145.24-3,215.16-911.21

Finding the Fourth Proportional to 2,145.24, 3,215.16 and 911.21

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Solution

The fourth proportional to 2,145.24, 3,215.16 and 911.21 is: 1,365.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.24 : 3,215.16 = 911.21 : x
  2. Step 2: Convert to fraction form
    2,145.24/3,215.16 = 911.21/x
  3. Step 3: Cross multiply
    2,145.24x = 3,215.16 × 911.21
  4. Step 4: Simplify right side
    2,145.24x = 2,929,669.87
  5. Step 5: Solve for x
    x = 2,929,669.87/2,145.24
  6. Step 6: Final answer
    x = 1,365.66

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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.