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Finding the Fourth Proportional to 777.76, 1,069.63 and 618.52

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Solution

The fourth proportional to 777.76, 1,069.63 and 618.52 is: 850.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.76 : 1,069.63 = 618.52 : x
  2. Step 2: Convert to fraction form
    777.76/1,069.63 = 618.52/x
  3. Step 3: Cross multiply
    777.76x = 1,069.63 × 618.52
  4. Step 4: Simplify right side
    777.76x = 661,583.33
  5. Step 5: Solve for x
    x = 661,583.33/777.76
  6. Step 6: Final answer
    x = 850.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.