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Finding the Fourth Proportional to 775.06, 1,161.53 and 427.88

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Solution

The fourth proportional to 775.06, 1,161.53 and 427.88 is: 641.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.06 : 1,161.53 = 427.88 : x
  2. Step 2: Convert to fraction form
    775.06/1,161.53 = 427.88/x
  3. Step 3: Cross multiply
    775.06x = 1,161.53 × 427.88
  4. Step 4: Simplify right side
    775.06x = 496,990.72
  5. Step 5: Solve for x
    x = 496,990.72/775.06
  6. Step 6: Final answer
    x = 641.23

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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.