Home / 2,128.77-3,192.13-742.07

Finding the Fourth Proportional to 2,128.77, 3,192.13 and 742.07

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Solution

The fourth proportional to 2,128.77, 3,192.13 and 742.07 is: 1,112.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.77 : 3,192.13 = 742.07 : x
  2. Step 2: Convert to fraction form
    2,128.77/3,192.13 = 742.07/x
  3. Step 3: Cross multiply
    2,128.77x = 3,192.13 × 742.07
  4. Step 4: Simplify right side
    2,128.77x = 2,368,783.91
  5. Step 5: Solve for x
    x = 2,368,783.91/2,128.77
  6. Step 6: Final answer
    x = 1,112.75

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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.