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Finding the Fourth Proportional to 3,139.82, 4,709.76 and 831.32

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Solution

The fourth proportional to 3,139.82, 4,709.76 and 831.32 is: 1,246.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.82 : 4,709.76 = 831.32 : x
  2. Step 2: Convert to fraction form
    3,139.82/4,709.76 = 831.32/x
  3. Step 3: Cross multiply
    3,139.82x = 4,709.76 × 831.32
  4. Step 4: Simplify right side
    3,139.82x = 3,915,317.68
  5. Step 5: Solve for x
    x = 3,915,317.68/3,139.82
  6. Step 6: Final answer
    x = 1,246.99

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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.