Home / 2,981.36-4,115.40-2,143.28

Finding the Fourth Proportional to 2,981.36, 4,115.40 and 2,143.28

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Solution

The fourth proportional to 2,981.36, 4,115.40 and 2,143.28 is: 2,958.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,981.36 : 4,115.40 = 2,143.28 : x
  2. Step 2: Convert to fraction form
    2,981.36/4,115.40 = 2,143.28/x
  3. Step 3: Cross multiply
    2,981.36x = 4,115.40 × 2,143.28
  4. Step 4: Simplify right side
    2,981.36x = 8,820,454.51
  5. Step 5: Solve for x
    x = 8,820,454.51/2,981.36
  6. Step 6: Final answer
    x = 2,958.53

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1.5x scale

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.