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Finding the Fourth Proportional to 103.76, 143.16 and 79.28

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Solution

The fourth proportional to 103.76, 143.16 and 79.28 is: 109.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.76 : 143.16 = 79.28 : x
  2. Step 2: Convert to fraction form
    103.76/143.16 = 79.28/x
  3. Step 3: Cross multiply
    103.76x = 143.16 × 79.28
  4. Step 4: Simplify right side
    103.76x = 11,349.72
  5. Step 5: Solve for x
    x = 11,349.72/103.76
  6. Step 6: Final answer
    x = 109.38

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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.