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Finding the Third Proportional to 420.56 and 610.50

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Solution

The third proportional to 420.56 and 610.50 is: 886.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.56 : 610.50 = 610.50 : x
  2. Step 2: Convert to fraction form
    420.56/610.50 = 610.50/x
  3. Step 3: Cross multiply
    420.56x = 610.50 × 610.50
  4. Step 4: Simplify right side
    420.56x = 372,710.25
  5. Step 5: Solve for x
    x = 372,710.25/420.56
  6. Step 6: Final answer
    x = 886.22

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.