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Finding the Fourth Proportional to 75.78, 113.69 and 21.68

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Solution

The fourth proportional to 75.78, 113.69 and 21.68 is: 32.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.78 : 113.69 = 21.68 : x
  2. Step 2: Convert to fraction form
    75.78/113.69 = 21.68/x
  3. Step 3: Cross multiply
    75.78x = 113.69 × 21.68
  4. Step 4: Simplify right side
    75.78x = 2,465.14
  5. Step 5: Solve for x
    x = 2,465.14/75.78
  6. Step 6: Final answer
    x = 32.53

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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.