Home / 2,128.88-2,937.92-1,289.74

Finding the Fourth Proportional to 2,128.88, 2,937.92 and 1,289.74

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Solution

The fourth proportional to 2,128.88, 2,937.92 and 1,289.74 is: 1,779.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.88 : 2,937.92 = 1,289.74 : x
  2. Step 2: Convert to fraction form
    2,128.88/2,937.92 = 1,289.74/x
  3. Step 3: Cross multiply
    2,128.88x = 2,937.92 × 1,289.74
  4. Step 4: Simplify right side
    2,128.88x = 3,789,152.94
  5. Step 5: Solve for x
    x = 3,789,152.94/2,128.88
  6. Step 6: Final answer
    x = 1,779.88

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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.