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Finding the Fourth Proportional to 769.04, 1,153.20 and 275.30

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Solution

The fourth proportional to 769.04, 1,153.20 and 275.30 is: 412.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.04 : 1,153.20 = 275.30 : x
  2. Step 2: Convert to fraction form
    769.04/1,153.20 = 275.30/x
  3. Step 3: Cross multiply
    769.04x = 1,153.20 × 275.30
  4. Step 4: Simplify right side
    769.04x = 317,475.96
  5. Step 5: Solve for x
    x = 317,475.96/769.04
  6. Step 6: Final answer
    x = 412.82

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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.