Home / 2,145.81-3,219.66-913.35

Finding the Fourth Proportional to 2,145.81, 3,219.66 and 913.35

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Solution

The fourth proportional to 2,145.81, 3,219.66 and 913.35 is: 1,370.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.81 : 3,219.66 = 913.35 : x
  2. Step 2: Convert to fraction form
    2,145.81/3,219.66 = 913.35/x
  3. Step 3: Cross multiply
    2,145.81x = 3,219.66 × 913.35
  4. Step 4: Simplify right side
    2,145.81x = 2,940,676.46
  5. Step 5: Solve for x
    x = 2,940,676.46/2,145.81
  6. Step 6: Final answer
    x = 1,370.43

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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.