Home / 2,142.81-3,215.30-845.19

Finding the Fourth Proportional to 2,142.81, 3,215.30 and 845.19

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Solution

The fourth proportional to 2,142.81, 3,215.30 and 845.19 is: 1,268.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.81 : 3,215.30 = 845.19 : x
  2. Step 2: Convert to fraction form
    2,142.81/3,215.30 = 845.19/x
  3. Step 3: Cross multiply
    2,142.81x = 3,215.30 × 845.19
  4. Step 4: Simplify right side
    2,142.81x = 2,717,535.18
  5. Step 5: Solve for x
    x = 2,717,535.18/2,142.81
  6. Step 6: Final answer
    x = 1,268.21

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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.