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Finding the Fourth Proportional to 852.21, 1,280.72 and 505.61

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Solution

The fourth proportional to 852.21, 1,280.72 and 505.61 is: 759.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.21 : 1,280.72 = 505.61 : x
  2. Step 2: Convert to fraction form
    852.21/1,280.72 = 505.61/x
  3. Step 3: Cross multiply
    852.21x = 1,280.72 × 505.61
  4. Step 4: Simplify right side
    852.21x = 647,544.50
  5. Step 5: Solve for x
    x = 647,544.50/852.21
  6. Step 6: Final answer
    x = 759.84

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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.