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Finding the Fourth Proportional to 75.80, 113.60 and 45.39

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Solution

The fourth proportional to 75.80, 113.60 and 45.39 is: 68.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.80 : 113.60 = 45.39 : x
  2. Step 2: Convert to fraction form
    75.80/113.60 = 45.39/x
  3. Step 3: Cross multiply
    75.80x = 113.60 × 45.39
  4. Step 4: Simplify right side
    75.80x = 5,156.84
  5. Step 5: Solve for x
    x = 5,156.84/75.80
  6. Step 6: Final answer
    x = 68.03

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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.