Home / 1,638.95-2,455.26-1,290.44

Finding the Fourth Proportional to 1,638.95, 2,455.26 and 1,290.44

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Solution

The fourth proportional to 1,638.95, 2,455.26 and 1,290.44 is: 1,933.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.95 : 2,455.26 = 1,290.44 : x
  2. Step 2: Convert to fraction form
    1,638.95/2,455.26 = 1,290.44/x
  3. Step 3: Cross multiply
    1,638.95x = 2,455.26 × 1,290.44
  4. Step 4: Simplify right side
    1,638.95x = 3,168,353.44
  5. Step 5: Solve for x
    x = 3,168,353.44/1,638.95
  6. Step 6: Final answer
    x = 1,933.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.