Home / 1,905.40-2,638.22-1,808.20

Finding the Fourth Proportional to 1,905.40, 2,638.22 and 1,808.20

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Solution

The fourth proportional to 1,905.40, 2,638.22 and 1,808.20 is: 2,503.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.40 : 2,638.22 = 1,808.20 : x
  2. Step 2: Convert to fraction form
    1,905.40/2,638.22 = 1,808.20/x
  3. Step 3: Cross multiply
    1,905.40x = 2,638.22 × 1,808.20
  4. Step 4: Simplify right side
    1,905.40x = 4,770,429.40
  5. Step 5: Solve for x
    x = 4,770,429.40/1,905.40
  6. Step 6: Final answer
    x = 2,503.64

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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.