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Finding the Fourth Proportional to 103.68, 142.88 and 76.01

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Solution

The fourth proportional to 103.68, 142.88 and 76.01 is: 104.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.68 : 142.88 = 76.01 : x
  2. Step 2: Convert to fraction form
    103.68/142.88 = 76.01/x
  3. Step 3: Cross multiply
    103.68x = 142.88 × 76.01
  4. Step 4: Simplify right side
    103.68x = 10,859.21
  5. Step 5: Solve for x
    x = 10,859.21/103.68
  6. Step 6: Final answer
    x = 104.74

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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.