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Finding the Third Proportional to 421.50 and 711.75

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Solution

The third proportional to 421.50 and 711.75 is: 1,201.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.50 : 711.75 = 711.75 : x
  2. Step 2: Convert to fraction form
    421.50/711.75 = 711.75/x
  3. Step 3: Cross multiply
    421.50x = 711.75 × 711.75
  4. Step 4: Simplify right side
    421.50x = 506,588.06
  5. Step 5: Solve for x
    x = 506,588.06/421.50
  6. Step 6: Final answer
    x = 1,201.87

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Why These Related Problems?

These problems maintain the same ratio (1.69) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.