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Finding the Fourth Proportional to 769.40, 1,153.24 and 336.12

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Solution

The fourth proportional to 769.40, 1,153.24 and 336.12 is: 503.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.40 : 1,153.24 = 336.12 : x
  2. Step 2: Convert to fraction form
    769.40/1,153.24 = 336.12/x
  3. Step 3: Cross multiply
    769.40x = 1,153.24 × 336.12
  4. Step 4: Simplify right side
    769.40x = 387,627.03
  5. Step 5: Solve for x
    x = 387,627.03/769.40
  6. Step 6: Final answer
    x = 503.80

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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.