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Finding the Fourth Proportional to 2,626.81, 3,940.28 and 777.95

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Solution

The fourth proportional to 2,626.81, 3,940.28 and 777.95 is: 1,166.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,626.81 : 3,940.28 = 777.95 : x
  2. Step 2: Convert to fraction form
    2,626.81/3,940.28 = 777.95/x
  3. Step 3: Cross multiply
    2,626.81x = 3,940.28 × 777.95
  4. Step 4: Simplify right side
    2,626.81x = 3,065,334.93
  5. Step 5: Solve for x
    x = 3,065,334.93/2,626.81
  6. Step 6: Final answer
    x = 1,166.94

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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.