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Finding the Fourth Proportional to 816.45, 1,223.63 and 451.48

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Solution

The fourth proportional to 816.45, 1,223.63 and 451.48 is: 676.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.45 : 1,223.63 = 451.48 : x
  2. Step 2: Convert to fraction form
    816.45/1,223.63 = 451.48/x
  3. Step 3: Cross multiply
    816.45x = 1,223.63 × 451.48
  4. Step 4: Simplify right side
    816.45x = 552,436.10
  5. Step 5: Solve for x
    x = 552,436.10/816.45
  6. Step 6: Final answer
    x = 676.63

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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.