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Finding the Third Proportional to 485 and 646.50

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Solution

The third proportional to 485 and 646.50 is: 861.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    485 : 646.50 = 646.50 : x
  2. Step 2: Convert to fraction form
    485/646.50 = 646.50/x
  3. Step 3: Cross multiply
    485x = 646.50 × 646.50
  4. Step 4: Simplify right side
    485x = 417,962.25
  5. Step 5: Solve for x
    x = 417,962.25/485
  6. Step 6: Final answer
    x = 861.78

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.