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Finding the Third Proportional to 478.13 and 627.19

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Solution

The third proportional to 478.13 and 627.19 is: 822.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.13 : 627.19 = 627.19 : x
  2. Step 2: Convert to fraction form
    478.13/627.19 = 627.19/x
  3. Step 3: Cross multiply
    478.13x = 627.19 × 627.19
  4. Step 4: Simplify right side
    478.13x = 393,364.16
  5. Step 5: Solve for x
    x = 393,364.16/478.13
  6. Step 6: Final answer
    x = 822.72

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.