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Finding the Fourth Proportional to 777.21, 1,163.79 and 452.40

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Solution

The fourth proportional to 777.21, 1,163.79 and 452.40 is: 677.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.21 : 1,163.79 = 452.40 : x
  2. Step 2: Convert to fraction form
    777.21/1,163.79 = 452.40/x
  3. Step 3: Cross multiply
    777.21x = 1,163.79 × 452.40
  4. Step 4: Simplify right side
    777.21x = 526,498.60
  5. Step 5: Solve for x
    x = 526,498.60/777.21
  6. Step 6: Final answer
    x = 677.42

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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.