Home / 2,128.20-3,188.25-1,248.54

Finding the Fourth Proportional to 2,128.20, 3,188.25 and 1,248.54

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Solution

The fourth proportional to 2,128.20, 3,188.25 and 1,248.54 is: 1,870.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.20 : 3,188.25 = 1,248.54 : x
  2. Step 2: Convert to fraction form
    2,128.20/3,188.25 = 1,248.54/x
  3. Step 3: Cross multiply
    2,128.20x = 3,188.25 × 1,248.54
  4. Step 4: Simplify right side
    2,128.20x = 3,980,657.66
  5. Step 5: Solve for x
    x = 3,980,657.66/2,128.20
  6. Step 6: Final answer
    x = 1,870.43

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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.