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Finding the Fourth Proportional to 1,889.12, 2,831.61 and 792.20

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Solution

The fourth proportional to 1,889.12, 2,831.61 and 792.20 is: 1,187.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,889.12 : 2,831.61 = 792.20 : x
  2. Step 2: Convert to fraction form
    1,889.12/2,831.61 = 792.20/x
  3. Step 3: Cross multiply
    1,889.12x = 2,831.61 × 792.20
  4. Step 4: Simplify right side
    1,889.12x = 2,243,187.28
  5. Step 5: Solve for x
    x = 2,243,187.28/1,889.12
  6. Step 6: Final answer
    x = 1,187.43

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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.