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Finding the Fourth Proportional to 3,428.60, 5,142.86 and 831.54

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Solution

The fourth proportional to 3,428.60, 5,142.86 and 831.54 is: 1,247.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,428.60 : 5,142.86 = 831.54 : x
  2. Step 2: Convert to fraction form
    3,428.60/5,142.86 = 831.54/x
  3. Step 3: Cross multiply
    3,428.60x = 5,142.86 × 831.54
  4. Step 4: Simplify right side
    3,428.60x = 4,276,493.80
  5. Step 5: Solve for x
    x = 4,276,493.80/3,428.60
  6. Step 6: Final answer
    x = 1,247.30

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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.