Home / 2,126.09-3,187.59-1,431.03

Finding the Fourth Proportional to 2,126.09, 3,187.59 and 1,431.03

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Solution

The fourth proportional to 2,126.09, 3,187.59 and 1,431.03 is: 2,145.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,126.09 : 3,187.59 = 1,431.03 : x
  2. Step 2: Convert to fraction form
    2,126.09/3,187.59 = 1,431.03/x
  3. Step 3: Cross multiply
    2,126.09x = 3,187.59 × 1,431.03
  4. Step 4: Simplify right side
    2,126.09x = 4,561,536.92
  5. Step 5: Solve for x
    x = 4,561,536.92/2,126.09
  6. Step 6: Final answer
    x = 2,145.51

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Half scale
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Double scale
Find fourth proportional to 2,127.09, 3,189.09 and 1,432.03
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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.