Home / 2,129.12-2,938.29-1,289.84

Finding the Fourth Proportional to 2,129.12, 2,938.29 and 1,289.84

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Solution

The fourth proportional to 2,129.12, 2,938.29 and 1,289.84 is: 1,780.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.12 : 2,938.29 = 1,289.84 : x
  2. Step 2: Convert to fraction form
    2,129.12/2,938.29 = 1,289.84/x
  3. Step 3: Cross multiply
    2,129.12x = 2,938.29 × 1,289.84
  4. Step 4: Simplify right side
    2,129.12x = 3,789,923.97
  5. Step 5: Solve for x
    x = 3,789,923.97/2,129.12
  6. Step 6: Final answer
    x = 1,780.04

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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.