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Finding the Fourth Proportional to 769.29, 1,154.13 and 221.51

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Solution

The fourth proportional to 769.29, 1,154.13 and 221.51 is: 332.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.29 : 1,154.13 = 221.51 : x
  2. Step 2: Convert to fraction form
    769.29/1,154.13 = 221.51/x
  3. Step 3: Cross multiply
    769.29x = 1,154.13 × 221.51
  4. Step 4: Simplify right side
    769.29x = 255,651.34
  5. Step 5: Solve for x
    x = 255,651.34/769.29
  6. Step 6: Final answer
    x = 332.32

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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.