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Finding the Fourth Proportional to 75.94, 113.78 and 65.20

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Solution

The fourth proportional to 75.94, 113.78 and 65.20 is: 97.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.94 : 113.78 = 65.20 : x
  2. Step 2: Convert to fraction form
    75.94/113.78 = 65.20/x
  3. Step 3: Cross multiply
    75.94x = 113.78 × 65.20
  4. Step 4: Simplify right side
    75.94x = 7,418.46
  5. Step 5: Solve for x
    x = 7,418.46/75.94
  6. Step 6: Final answer
    x = 97.69

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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.