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Finding the Fourth Proportional to 851.22, 1,277.01 and 266.21

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Solution

The fourth proportional to 851.22, 1,277.01 and 266.21 is: 399.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.22 : 1,277.01 = 266.21 : x
  2. Step 2: Convert to fraction form
    851.22/1,277.01 = 266.21/x
  3. Step 3: Cross multiply
    851.22x = 1,277.01 × 266.21
  4. Step 4: Simplify right side
    851.22x = 339,946.45
  5. Step 5: Solve for x
    x = 339,946.45/851.22
  6. Step 6: Final answer
    x = 399.36

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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.