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Finding the Third Proportional to 488.50 and 785.75

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Solution

The third proportional to 488.50 and 785.75 is: 1,263.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.50 : 785.75 = 785.75 : x
  2. Step 2: Convert to fraction form
    488.50/785.75 = 785.75/x
  3. Step 3: Cross multiply
    488.50x = 785.75 × 785.75
  4. Step 4: Simplify right side
    488.50x = 617,403.06
  5. Step 5: Solve for x
    x = 617,403.06/488.50
  6. Step 6: Final answer
    x = 1,263.88

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.