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Finding the Third Proportional to 420.50 and 617

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Solution

The third proportional to 420.50 and 617 is: 905.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.50 : 617 = 617 : x
  2. Step 2: Convert to fraction form
    420.50/617 = 617/x
  3. Step 3: Cross multiply
    420.50x = 617 × 617
  4. Step 4: Simplify right side
    420.50x = 380,689
  5. Step 5: Solve for x
    x = 380,689/420.50
  6. Step 6: Final answer
    x = 905.32

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.