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Finding the Fourth Proportional to 814.89, 1,221.06 and 485.19

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Solution

The fourth proportional to 814.89, 1,221.06 and 485.19 is: 727.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.89 : 1,221.06 = 485.19 : x
  2. Step 2: Convert to fraction form
    814.89/1,221.06 = 485.19/x
  3. Step 3: Cross multiply
    814.89x = 1,221.06 × 485.19
  4. Step 4: Simplify right side
    814.89x = 592,446.10
  5. Step 5: Solve for x
    x = 592,446.10/814.89
  6. Step 6: Final answer
    x = 727.03

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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.