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Finding the Fourth Proportional to 769.71, 1,154.62 and 380.03

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Solution

The fourth proportional to 769.71, 1,154.62 and 380.03 is: 570.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.71 : 1,154.62 = 380.03 : x
  2. Step 2: Convert to fraction form
    769.71/1,154.62 = 380.03/x
  3. Step 3: Cross multiply
    769.71x = 1,154.62 × 380.03
  4. Step 4: Simplify right side
    769.71x = 438,790.24
  5. Step 5: Solve for x
    x = 438,790.24/769.71
  6. Step 6: Final answer
    x = 570.07

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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.