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Finding the Fourth Proportional to 75.88, 104.69 and 51.39

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Solution

The fourth proportional to 75.88, 104.69 and 51.39 is: 70.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.88 : 104.69 = 51.39 : x
  2. Step 2: Convert to fraction form
    75.88/104.69 = 51.39/x
  3. Step 3: Cross multiply
    75.88x = 104.69 × 51.39
  4. Step 4: Simplify right side
    75.88x = 5,379.76
  5. Step 5: Solve for x
    x = 5,379.76/75.88
  6. Step 6: Final answer
    x = 70.90

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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.