Home / 1,421.80-1,946.97-1,396.20

Finding the Fourth Proportional to 1,421.80, 1,946.97 and 1,396.20

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Solution

The fourth proportional to 1,421.80, 1,946.97 and 1,396.20 is: 1,911.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.80 : 1,946.97 = 1,396.20 : x
  2. Step 2: Convert to fraction form
    1,421.80/1,946.97 = 1,396.20/x
  3. Step 3: Cross multiply
    1,421.80x = 1,946.97 × 1,396.20
  4. Step 4: Simplify right side
    1,421.80x = 2,718,359.51
  5. Step 5: Solve for x
    x = 2,718,359.51/1,421.80
  6. Step 6: Final answer
    x = 1,911.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.