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Finding the Third Proportional to 428 and 648.50

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Solution

The third proportional to 428 and 648.50 is: 982.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428 : 648.50 = 648.50 : x
  2. Step 2: Convert to fraction form
    428/648.50 = 648.50/x
  3. Step 3: Cross multiply
    428x = 648.50 × 648.50
  4. Step 4: Simplify right side
    428x = 420,552.25
  5. Step 5: Solve for x
    x = 420,552.25/428
  6. Step 6: Final answer
    x = 982.60

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.