Home / 2,167.20-2,990.69-1,222.99

Finding the Fourth Proportional to 2,167.20, 2,990.69 and 1,222.99

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Solution

The fourth proportional to 2,167.20, 2,990.69 and 1,222.99 is: 1,687.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,167.20 : 2,990.69 = 1,222.99 : x
  2. Step 2: Convert to fraction form
    2,167.20/2,990.69 = 1,222.99/x
  3. Step 3: Cross multiply
    2,167.20x = 2,990.69 × 1,222.99
  4. Step 4: Simplify right side
    2,167.20x = 3,657,583.96
  5. Step 5: Solve for x
    x = 3,657,583.96/2,167.20
  6. Step 6: Final answer
    x = 1,687.70

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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.