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Finding the Fourth Proportional to 851.78, 1,277.31 and 266.63

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Solution

The fourth proportional to 851.78, 1,277.31 and 266.63 is: 399.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.78 : 1,277.31 = 266.63 : x
  2. Step 2: Convert to fraction form
    851.78/1,277.31 = 266.63/x
  3. Step 3: Cross multiply
    851.78x = 1,277.31 × 266.63
  4. Step 4: Simplify right side
    851.78x = 340,562.78
  5. Step 5: Solve for x
    x = 340,562.78/851.78
  6. Step 6: Final answer
    x = 399.82

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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.