Home / 2,138.75-2,948.63-1,920.05

Finding the Fourth Proportional to 2,138.75, 2,948.63 and 1,920.05

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Solution

The fourth proportional to 2,138.75, 2,948.63 and 1,920.05 is: 2,647.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.75 : 2,948.63 = 1,920.05 : x
  2. Step 2: Convert to fraction form
    2,138.75/2,948.63 = 1,920.05/x
  3. Step 3: Cross multiply
    2,138.75x = 2,948.63 × 1,920.05
  4. Step 4: Simplify right side
    2,138.75x = 5,661,492.69
  5. Step 5: Solve for x
    x = 5,661,492.69/2,138.75
  6. Step 6: Final answer
    x = 2,647.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.