Home / 2,121.35-3,178.80-1,298.48

Finding the Fourth Proportional to 2,121.35, 3,178.80 and 1,298.48

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Solution

The fourth proportional to 2,121.35, 3,178.80 and 1,298.48 is: 1,945.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.35 : 3,178.80 = 1,298.48 : x
  2. Step 2: Convert to fraction form
    2,121.35/3,178.80 = 1,298.48/x
  3. Step 3: Cross multiply
    2,121.35x = 3,178.80 × 1,298.48
  4. Step 4: Simplify right side
    2,121.35x = 4,127,592.33
  5. Step 5: Solve for x
    x = 4,127,592.33/2,121.35
  6. Step 6: Final answer
    x = 1,945.74

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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.