Home / 1,821.29-2,512.42-1,290.13

Finding the Fourth Proportional to 1,821.29, 2,512.42 and 1,290.13

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Solution

The fourth proportional to 1,821.29, 2,512.42 and 1,290.13 is: 1,779.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.29 : 2,512.42 = 1,290.13 : x
  2. Step 2: Convert to fraction form
    1,821.29/2,512.42 = 1,290.13/x
  3. Step 3: Cross multiply
    1,821.29x = 2,512.42 × 1,290.13
  4. Step 4: Simplify right side
    1,821.29x = 3,241,338.91
  5. Step 5: Solve for x
    x = 3,241,338.91/1,821.29
  6. Step 6: Final answer
    x = 1,779.70

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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.