Home / 2,123.80-3,188.10-1,258.60

Finding the Fourth Proportional to 2,123.80, 3,188.10 and 1,258.60

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Solution

The fourth proportional to 2,123.80, 3,188.10 and 1,258.60 is: 1,889.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,123.80 : 3,188.10 = 1,258.60 : x
  2. Step 2: Convert to fraction form
    2,123.80/3,188.10 = 1,258.60/x
  3. Step 3: Cross multiply
    2,123.80x = 3,188.10 × 1,258.60
  4. Step 4: Simplify right side
    2,123.80x = 4,012,542.66
  5. Step 5: Solve for x
    x = 4,012,542.66/2,123.80
  6. Step 6: Final answer
    x = 1,889.32

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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.