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Finding the Fourth Proportional to 142.48, 196.64 and 103.76

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Solution

The fourth proportional to 142.48, 196.64 and 103.76 is: 143.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.48 : 196.64 = 103.76 : x
  2. Step 2: Convert to fraction form
    142.48/196.64 = 103.76/x
  3. Step 3: Cross multiply
    142.48x = 196.64 × 103.76
  4. Step 4: Simplify right side
    142.48x = 20,403.37
  5. Step 5: Solve for x
    x = 20,403.37/142.48
  6. Step 6: Final answer
    x = 143.20

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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.