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Finding the Third Proportional to 421.88 and 655.88

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Solution

The third proportional to 421.88 and 655.88 is: 1,019.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.88 : 655.88 = 655.88 : x
  2. Step 2: Convert to fraction form
    421.88/655.88 = 655.88/x
  3. Step 3: Cross multiply
    421.88x = 655.88 × 655.88
  4. Step 4: Simplify right side
    421.88x = 430,172.02
  5. Step 5: Solve for x
    x = 430,172.02/421.88
  6. Step 6: Final answer
    x = 1,019.67

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.