Home / 1,972.80-2,722.08-1,382.40

Finding the Fourth Proportional to 1,972.80, 2,722.08 and 1,382.40

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Solution

The fourth proportional to 1,972.80, 2,722.08 and 1,382.40 is: 1,907.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,972.80 : 2,722.08 = 1,382.40 : x
  2. Step 2: Convert to fraction form
    1,972.80/2,722.08 = 1,382.40/x
  3. Step 3: Cross multiply
    1,972.80x = 2,722.08 × 1,382.40
  4. Step 4: Simplify right side
    1,972.80x = 3,763,003.39
  5. Step 5: Solve for x
    x = 3,763,003.39/1,972.80
  6. Step 6: Final answer
    x = 1,907.44

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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.