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Finding the Third Proportional to 65.63 and 72.09

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Solution

The third proportional to 65.63 and 72.09 is: 79.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.63 : 72.09 = 72.09 : x
  2. Step 2: Convert to fraction form
    65.63/72.09 = 72.09/x
  3. Step 3: Cross multiply
    65.63x = 72.09 × 72.09
  4. Step 4: Simplify right side
    65.63x = 5,197.51
  5. Step 5: Solve for x
    x = 5,197.51/65.63
  6. Step 6: Final answer
    x = 79.20

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.