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Finding the Fourth Proportional to 103.36, 142.64 and 70.64

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Solution

The fourth proportional to 103.36, 142.64 and 70.64 is: 97.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.36 : 142.64 = 70.64 : x
  2. Step 2: Convert to fraction form
    103.36/142.64 = 70.64/x
  3. Step 3: Cross multiply
    103.36x = 142.64 × 70.64
  4. Step 4: Simplify right side
    103.36x = 10,076.09
  5. Step 5: Solve for x
    x = 10,076.09/103.36
  6. Step 6: Final answer
    x = 97.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.