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Finding the Third Proportional to 421.50 and 572.25

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Solution

The third proportional to 421.50 and 572.25 is: 776.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.50 : 572.25 = 572.25 : x
  2. Step 2: Convert to fraction form
    421.50/572.25 = 572.25/x
  3. Step 3: Cross multiply
    421.50x = 572.25 × 572.25
  4. Step 4: Simplify right side
    421.50x = 327,470.06
  5. Step 5: Solve for x
    x = 327,470.06/421.50
  6. Step 6: Final answer
    x = 776.92

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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.