Home / 1,621.40-2,236.80-1,290.26

Finding the Fourth Proportional to 1,621.40, 2,236.80 and 1,290.26

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Solution

The fourth proportional to 1,621.40, 2,236.80 and 1,290.26 is: 1,779.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.40 : 2,236.80 = 1,290.26 : x
  2. Step 2: Convert to fraction form
    1,621.40/2,236.80 = 1,290.26/x
  3. Step 3: Cross multiply
    1,621.40x = 2,236.80 × 1,290.26
  4. Step 4: Simplify right side
    1,621.40x = 2,886,053.57
  5. Step 5: Solve for x
    x = 2,886,053.57/1,621.40
  6. Step 6: Final answer
    x = 1,779.98

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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.