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Finding the Third Proportional to 530 and 821.50

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Solution

The third proportional to 530 and 821.50 is: 1,273.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    530 : 821.50 = 821.50 : x
  2. Step 2: Convert to fraction form
    530/821.50 = 821.50/x
  3. Step 3: Cross multiply
    530x = 821.50 × 821.50
  4. Step 4: Simplify right side
    530x = 674,862.25
  5. Step 5: Solve for x
    x = 674,862.25/530
  6. Step 6: Final answer
    x = 1,273.33

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.