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Finding the Fourth Proportional to 75.45, 113.91 and 75.05

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Solution

The fourth proportional to 75.45, 113.91 and 75.05 is: 113.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.45 : 113.91 = 75.05 : x
  2. Step 2: Convert to fraction form
    75.45/113.91 = 75.05/x
  3. Step 3: Cross multiply
    75.45x = 113.91 × 75.05
  4. Step 4: Simplify right side
    75.45x = 8,548.95
  5. Step 5: Solve for x
    x = 8,548.95/75.45
  6. Step 6: Final answer
    x = 113.31

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.