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Finding the Fourth Proportional to 851.31, 1,277.36 and 505.33

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Solution

The fourth proportional to 851.31, 1,277.36 and 505.33 is: 758.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.31 : 1,277.36 = 505.33 : x
  2. Step 2: Convert to fraction form
    851.31/1,277.36 = 505.33/x
  3. Step 3: Cross multiply
    851.31x = 1,277.36 × 505.33
  4. Step 4: Simplify right side
    851.31x = 645,488.33
  5. Step 5: Solve for x
    x = 645,488.33/851.31
  6. Step 6: Final answer
    x = 758.23

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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.