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Finding the Fourth Proportional to 3,139.61, 4,709.39 and 831.11

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Solution

The fourth proportional to 3,139.61, 4,709.39 and 831.11 is: 1,246.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.61 : 4,709.39 = 831.11 : x
  2. Step 2: Convert to fraction form
    3,139.61/4,709.39 = 831.11/x
  3. Step 3: Cross multiply
    3,139.61x = 4,709.39 × 831.11
  4. Step 4: Simplify right side
    3,139.61x = 3,913,993.42
  5. Step 5: Solve for x
    x = 3,913,993.42/3,139.61
  6. Step 6: Final answer
    x = 1,246.65

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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.