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Finding the Fourth Proportional to 75.63, 113.31 and 71.85

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Solution

The fourth proportional to 75.63, 113.31 and 71.85 is: 107.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.63 : 113.31 = 71.85 : x
  2. Step 2: Convert to fraction form
    75.63/113.31 = 71.85/x
  3. Step 3: Cross multiply
    75.63x = 113.31 × 71.85
  4. Step 4: Simplify right side
    75.63x = 8,141.32
  5. Step 5: Solve for x
    x = 8,141.32/75.63
  6. Step 6: Final answer
    x = 107.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.