Home / 2,990.40-4,126.80-1,664.12

Finding the Fourth Proportional to 2,990.40, 4,126.80 and 1,664.12

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Solution

The fourth proportional to 2,990.40, 4,126.80 and 1,664.12 is: 2,296.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.40 : 4,126.80 = 1,664.12 : x
  2. Step 2: Convert to fraction form
    2,990.40/4,126.80 = 1,664.12/x
  3. Step 3: Cross multiply
    2,990.40x = 4,126.80 × 1,664.12
  4. Step 4: Simplify right side
    2,990.40x = 6,867,490.42
  5. Step 5: Solve for x
    x = 6,867,490.42/2,990.40
  6. Step 6: Final answer
    x = 2,296.51

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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.