Home / 1,555.90-2,147.22-926.80

Finding the Fourth Proportional to 1,555.90, 2,147.22 and 926.80

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Solution

The fourth proportional to 1,555.90, 2,147.22 and 926.80 is: 1,279.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.90 : 2,147.22 = 926.80 : x
  2. Step 2: Convert to fraction form
    1,555.90/2,147.22 = 926.80/x
  3. Step 3: Cross multiply
    1,555.90x = 2,147.22 × 926.80
  4. Step 4: Simplify right side
    1,555.90x = 1,990,043.50
  5. Step 5: Solve for x
    x = 1,990,043.50/1,555.90
  6. Step 6: Final answer
    x = 1,279.03

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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.