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Finding the Third Proportional to 39.75 and 53.63

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Solution

The third proportional to 39.75 and 53.63 is: 72.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.75 : 53.63 = 53.63 : x
  2. Step 2: Convert to fraction form
    39.75/53.63 = 53.63/x
  3. Step 3: Cross multiply
    39.75x = 53.63 × 53.63
  4. Step 4: Simplify right side
    39.75x = 2,875.64
  5. Step 5: Solve for x
    x = 2,875.64/39.75
  6. Step 6: Final answer
    x = 72.34

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.