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Finding the Fourth Proportional to 851.23, 1,276.86 and 266.23

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Solution

The fourth proportional to 851.23, 1,276.86 and 266.23 is: 399.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.23 : 1,276.86 = 266.23 : x
  2. Step 2: Convert to fraction form
    851.23/1,276.86 = 266.23/x
  3. Step 3: Cross multiply
    851.23x = 1,276.86 × 266.23
  4. Step 4: Simplify right side
    851.23x = 339,938.44
  5. Step 5: Solve for x
    x = 339,938.44/851.23
  6. Step 6: Final answer
    x = 399.35

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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.