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Finding the Fourth Proportional to 3,163.80, 4,745.78 and 972.55

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Solution

The fourth proportional to 3,163.80, 4,745.78 and 972.55 is: 1,458.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,163.80 : 4,745.78 = 972.55 : x
  2. Step 2: Convert to fraction form
    3,163.80/4,745.78 = 972.55/x
  3. Step 3: Cross multiply
    3,163.80x = 4,745.78 × 972.55
  4. Step 4: Simplify right side
    3,163.80x = 4,615,491.61
  5. Step 5: Solve for x
    x = 4,615,491.61/3,163.80
  6. Step 6: Final answer
    x = 1,458.84

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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.