Home / 2,990.81-4,129.35-1,872.20

Finding the Fourth Proportional to 2,990.81, 4,129.35 and 1,872.20

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Solution

The fourth proportional to 2,990.81, 4,129.35 and 1,872.20 is: 2,584.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.81 : 4,129.35 = 1,872.20 : x
  2. Step 2: Convert to fraction form
    2,990.81/4,129.35 = 1,872.20/x
  3. Step 3: Cross multiply
    2,990.81x = 4,129.35 × 1,872.20
  4. Step 4: Simplify right side
    2,990.81x = 7,730,969.07
  5. Step 5: Solve for x
    x = 7,730,969.07/2,990.81
  6. Step 6: Final answer
    x = 2,584.91

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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.