Home / 2,129.38-2,938.60-1,290.22

Finding the Fourth Proportional to 2,129.38, 2,938.60 and 1,290.22

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Solution

The fourth proportional to 2,129.38, 2,938.60 and 1,290.22 is: 1,780.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.38 : 2,938.60 = 1,290.22 : x
  2. Step 2: Convert to fraction form
    2,129.38/2,938.60 = 1,290.22/x
  3. Step 3: Cross multiply
    2,129.38x = 2,938.60 × 1,290.22
  4. Step 4: Simplify right side
    2,129.38x = 3,791,440.49
  5. Step 5: Solve for x
    x = 3,791,440.49/2,129.38
  6. Step 6: Final answer
    x = 1,780.54

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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.