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Finding the Third Proportional to 64.88 and 142.13

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Solution

The third proportional to 64.88 and 142.13 is: 311.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.88 : 142.13 = 142.13 : x
  2. Step 2: Convert to fraction form
    64.88/142.13 = 142.13/x
  3. Step 3: Cross multiply
    64.88x = 142.13 × 142.13
  4. Step 4: Simplify right side
    64.88x = 20,199.52
  5. Step 5: Solve for x
    x = 20,199.52/64.88
  6. Step 6: Final answer
    x = 311.36

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.