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Finding the Fourth Proportional to 820.36, 1,230.86 and 495.96

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Solution

The fourth proportional to 820.36, 1,230.86 and 495.96 is: 744.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.36 : 1,230.86 = 495.96 : x
  2. Step 2: Convert to fraction form
    820.36/1,230.86 = 495.96/x
  3. Step 3: Cross multiply
    820.36x = 1,230.86 × 495.96
  4. Step 4: Simplify right side
    820.36x = 610,457.33
  5. Step 5: Solve for x
    x = 610,457.33/820.36
  6. Step 6: Final answer
    x = 744.13

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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.