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Finding the Fourth Proportional to 1,831.56, 2,747.74 and 857.12

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Solution

The fourth proportional to 1,831.56, 2,747.74 and 857.12 is: 1,285.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,831.56 : 2,747.74 = 857.12 : x
  2. Step 2: Convert to fraction form
    1,831.56/2,747.74 = 857.12/x
  3. Step 3: Cross multiply
    1,831.56x = 2,747.74 × 857.12
  4. Step 4: Simplify right side
    1,831.56x = 2,355,142.91
  5. Step 5: Solve for x
    x = 2,355,142.91/1,831.56
  6. Step 6: Final answer
    x = 1,285.87

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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.