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Finding the Fourth Proportional to 816.13, 1,221.76 and 490.51

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Solution

The fourth proportional to 816.13, 1,221.76 and 490.51 is: 734.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.13 : 1,221.76 = 490.51 : x
  2. Step 2: Convert to fraction form
    816.13/1,221.76 = 490.51/x
  3. Step 3: Cross multiply
    816.13x = 1,221.76 × 490.51
  4. Step 4: Simplify right side
    816.13x = 599,285.50
  5. Step 5: Solve for x
    x = 599,285.50/816.13
  6. Step 6: Final answer
    x = 734.30

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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.