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Finding the Third Proportional to 561 and 865.50

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Solution

The third proportional to 561 and 865.50 is: 1,335.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    561 : 865.50 = 865.50 : x
  2. Step 2: Convert to fraction form
    561/865.50 = 865.50/x
  3. Step 3: Cross multiply
    561x = 865.50 × 865.50
  4. Step 4: Simplify right side
    561x = 749,090.25
  5. Step 5: Solve for x
    x = 749,090.25/561
  6. Step 6: Final answer
    x = 1,335.28

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.