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Finding the Fourth Proportional to 851.69, 1,277.67 and 418.88

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Solution

The fourth proportional to 851.69, 1,277.67 and 418.88 is: 628.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.69 : 1,277.67 = 418.88 : x
  2. Step 2: Convert to fraction form
    851.69/1,277.67 = 418.88/x
  3. Step 3: Cross multiply
    851.69x = 1,277.67 × 418.88
  4. Step 4: Simplify right side
    851.69x = 535,190.41
  5. Step 5: Solve for x
    x = 535,190.41/851.69
  6. Step 6: Final answer
    x = 628.39

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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.