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Finding the Fourth Proportional to 7,781.76, 11,674.80 and 3,280.80

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Solution

The fourth proportional to 7,781.76, 11,674.80 and 3,280.80 is: 4,922.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,781.76 : 11,674.80 = 3,280.80 : x
  2. Step 2: Convert to fraction form
    7,781.76/11,674.80 = 3,280.80/x
  3. Step 3: Cross multiply
    7,781.76x = 11,674.80 × 3,280.80
  4. Step 4: Simplify right side
    7,781.76x = 38,302,683.84
  5. Step 5: Solve for x
    x = 38,302,683.84/7,781.76
  6. Step 6: Final answer
    x = 4,922.11

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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.