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Finding the Fourth Proportional to 851.16, 1,276.79 and 266.27

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Solution

The fourth proportional to 851.16, 1,276.79 and 266.27 is: 399.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.16 : 1,276.79 = 266.27 : x
  2. Step 2: Convert to fraction form
    851.16/1,276.79 = 266.27/x
  3. Step 3: Cross multiply
    851.16x = 1,276.79 × 266.27
  4. Step 4: Simplify right side
    851.16x = 339,970.87
  5. Step 5: Solve for x
    x = 339,970.87/851.16
  6. Step 6: Final answer
    x = 399.42

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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.