Home / 1,951.67-2,690.60-1,321.20

Finding the Fourth Proportional to 1,951.67, 2,690.60 and 1,321.20

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Solution

The fourth proportional to 1,951.67, 2,690.60 and 1,321.20 is: 1,821.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,951.67 : 2,690.60 = 1,321.20 : x
  2. Step 2: Convert to fraction form
    1,951.67/2,690.60 = 1,321.20/x
  3. Step 3: Cross multiply
    1,951.67x = 2,690.60 × 1,321.20
  4. Step 4: Simplify right side
    1,951.67x = 3,554,814.11
  5. Step 5: Solve for x
    x = 3,554,814.11/1,951.67
  6. Step 6: Final answer
    x = 1,821.43

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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.