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Finding the Third Proportional to 421.13 and 668.72

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Solution

The third proportional to 421.13 and 668.72 is: 1,061.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.13 : 668.72 = 668.72 : x
  2. Step 2: Convert to fraction form
    421.13/668.72 = 668.72/x
  3. Step 3: Cross multiply
    421.13x = 668.72 × 668.72
  4. Step 4: Simplify right side
    421.13x = 447,184.77
  5. Step 5: Solve for x
    x = 447,184.77/421.13
  6. Step 6: Final answer
    x = 1,061.88

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.