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Finding the Fourth Proportional to 769.32, 1,153 and 553.32

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Solution

The fourth proportional to 769.32, 1,153 and 553.32 is: 829.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.32 : 1,153 = 553.32 : x
  2. Step 2: Convert to fraction form
    769.32/1,153 = 553.32/x
  3. Step 3: Cross multiply
    769.32x = 1,153 × 553.32
  4. Step 4: Simplify right side
    769.32x = 637,977.96
  5. Step 5: Solve for x
    x = 637,977.96/769.32
  6. Step 6: Final answer
    x = 829.28

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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.