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Finding the Fourth Proportional to 680.63, 1,021.06 and 269.77

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Solution

The fourth proportional to 680.63, 1,021.06 and 269.77 is: 404.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.63 : 1,021.06 = 269.77 : x
  2. Step 2: Convert to fraction form
    680.63/1,021.06 = 269.77/x
  3. Step 3: Cross multiply
    680.63x = 1,021.06 × 269.77
  4. Step 4: Simplify right side
    680.63x = 275,448.10
  5. Step 5: Solve for x
    x = 275,448.10/680.63
  6. Step 6: Final answer
    x = 404.70

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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.