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Finding the Fourth Proportional to 3,171.19, 4,756.80 and 831.19

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Solution

The fourth proportional to 3,171.19, 4,756.80 and 831.19 is: 1,246.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,171.19 : 4,756.80 = 831.19 : x
  2. Step 2: Convert to fraction form
    3,171.19/4,756.80 = 831.19/x
  3. Step 3: Cross multiply
    3,171.19x = 4,756.80 × 831.19
  4. Step 4: Simplify right side
    3,171.19x = 3,953,804.59
  5. Step 5: Solve for x
    x = 3,953,804.59/3,171.19
  6. Step 6: Final answer
    x = 1,246.79

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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.