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Finding the Third Proportional to 421.50 and 486.75

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Solution

The third proportional to 421.50 and 486.75 is: 562.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.50 : 486.75 = 486.75 : x
  2. Step 2: Convert to fraction form
    421.50/486.75 = 486.75/x
  3. Step 3: Cross multiply
    421.50x = 486.75 × 486.75
  4. Step 4: Simplify right side
    421.50x = 236,925.56
  5. Step 5: Solve for x
    x = 236,925.56/421.50
  6. Step 6: Final answer
    x = 562.10

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.