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Finding the Third Proportional to 421.31 and 573.19

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Solution

The third proportional to 421.31 and 573.19 is: 779.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.31 : 573.19 = 573.19 : x
  2. Step 2: Convert to fraction form
    421.31/573.19 = 573.19/x
  3. Step 3: Cross multiply
    421.31x = 573.19 × 573.19
  4. Step 4: Simplify right side
    421.31x = 328,543.91
  5. Step 5: Solve for x
    x = 328,543.91/421.31
  6. Step 6: Final answer
    x = 779.81

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.