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Finding the Fourth Proportional to 769.85, 1,153.97 and 358.65

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Solution

The fourth proportional to 769.85, 1,153.97 and 358.65 is: 537.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.85 : 1,153.97 = 358.65 : x
  2. Step 2: Convert to fraction form
    769.85/1,153.97 = 358.65/x
  3. Step 3: Cross multiply
    769.85x = 1,153.97 × 358.65
  4. Step 4: Simplify right side
    769.85x = 413,870.89
  5. Step 5: Solve for x
    x = 413,870.89/769.85
  6. Step 6: Final answer
    x = 537.60

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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.