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Finding the Fourth Proportional to 76.02, 105.65 and 75.21

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Solution

The fourth proportional to 76.02, 105.65 and 75.21 is: 104.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.02 : 105.65 = 75.21 : x
  2. Step 2: Convert to fraction form
    76.02/105.65 = 75.21/x
  3. Step 3: Cross multiply
    76.02x = 105.65 × 75.21
  4. Step 4: Simplify right side
    76.02x = 7,945.94
  5. Step 5: Solve for x
    x = 7,945.94/76.02
  6. Step 6: Final answer
    x = 104.52

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.