Home / 2,148.21-3,221.37-687.51

Finding the Fourth Proportional to 2,148.21, 3,221.37 and 687.51

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Solution

The fourth proportional to 2,148.21, 3,221.37 and 687.51 is: 1,030.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,148.21 : 3,221.37 = 687.51 : x
  2. Step 2: Convert to fraction form
    2,148.21/3,221.37 = 687.51/x
  3. Step 3: Cross multiply
    2,148.21x = 3,221.37 × 687.51
  4. Step 4: Simplify right side
    2,148.21x = 2,214,724.09
  5. Step 5: Solve for x
    x = 2,214,724.09/2,148.21
  6. Step 6: Final answer
    x = 1,030.96

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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.