Home / 2,143.80-3,215.85-911.07

Finding the Fourth Proportional to 2,143.80, 3,215.85 and 911.07

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Solution

The fourth proportional to 2,143.80, 3,215.85 and 911.07 is: 1,366.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.80 : 3,215.85 = 911.07 : x
  2. Step 2: Convert to fraction form
    2,143.80/3,215.85 = 911.07/x
  3. Step 3: Cross multiply
    2,143.80x = 3,215.85 × 911.07
  4. Step 4: Simplify right side
    2,143.80x = 2,929,864.46
  5. Step 5: Solve for x
    x = 2,929,864.46/2,143.80
  6. Step 6: Final answer
    x = 1,366.67

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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.