Home / 2,148.30-3,222.69-687.12

Finding the Fourth Proportional to 2,148.30, 3,222.69 and 687.12

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Solution

The fourth proportional to 2,148.30, 3,222.69 and 687.12 is: 1,030.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,148.30 : 3,222.69 = 687.12 : x
  2. Step 2: Convert to fraction form
    2,148.30/3,222.69 = 687.12/x
  3. Step 3: Cross multiply
    2,148.30x = 3,222.69 × 687.12
  4. Step 4: Simplify right side
    2,148.30x = 2,214,374.75
  5. Step 5: Solve for x
    x = 2,214,374.75/2,148.30
  6. Step 6: Final answer
    x = 1,030.76

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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.