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Finding the Third Proportional to 421.45 and 630.28

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Solution

The third proportional to 421.45 and 630.28 is: 942.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.45 : 630.28 = 630.28 : x
  2. Step 2: Convert to fraction form
    421.45/630.28 = 630.28/x
  3. Step 3: Cross multiply
    421.45x = 630.28 × 630.28
  4. Step 4: Simplify right side
    421.45x = 397,254.45
  5. Step 5: Solve for x
    x = 397,254.45/421.45
  6. Step 6: Final answer
    x = 942.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.