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Finding the Third Proportional to 457.50 and 620.25

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Solution

The third proportional to 457.50 and 620.25 is: 840.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.50 : 620.25 = 620.25 : x
  2. Step 2: Convert to fraction form
    457.50/620.25 = 620.25/x
  3. Step 3: Cross multiply
    457.50x = 620.25 × 620.25
  4. Step 4: Simplify right side
    457.50x = 384,710.06
  5. Step 5: Solve for x
    x = 384,710.06/457.50
  6. Step 6: Final answer
    x = 840.90

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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.