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Finding the Fourth Proportional to 2,806.40, 4,209.12 and 831.98

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Solution

The fourth proportional to 2,806.40, 4,209.12 and 831.98 is: 1,247.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,806.40 : 4,209.12 = 831.98 : x
  2. Step 2: Convert to fraction form
    2,806.40/4,209.12 = 831.98/x
  3. Step 3: Cross multiply
    2,806.40x = 4,209.12 × 831.98
  4. Step 4: Simplify right side
    2,806.40x = 3,501,903.66
  5. Step 5: Solve for x
    x = 3,501,903.66/2,806.40
  6. Step 6: Final answer
    x = 1,247.83

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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.