Home / 2,129.55-2,939.30-1,421.43

Finding the Fourth Proportional to 2,129.55, 2,939.30 and 1,421.43

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Solution

The fourth proportional to 2,129.55, 2,939.30 and 1,421.43 is: 1,961.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.55 : 2,939.30 = 1,421.43 : x
  2. Step 2: Convert to fraction form
    2,129.55/2,939.30 = 1,421.43/x
  3. Step 3: Cross multiply
    2,129.55x = 2,939.30 × 1,421.43
  4. Step 4: Simplify right side
    2,129.55x = 4,178,002.09
  5. Step 5: Solve for x
    x = 4,178,002.09/2,129.55
  6. Step 6: Final answer
    x = 1,961.92

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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.