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Finding the Fourth Proportional to 75.78, 113.61 and 43.74

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Solution

The fourth proportional to 75.78, 113.61 and 43.74 is: 65.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.78 : 113.61 = 43.74 : x
  2. Step 2: Convert to fraction form
    75.78/113.61 = 43.74/x
  3. Step 3: Cross multiply
    75.78x = 113.61 × 43.74
  4. Step 4: Simplify right side
    75.78x = 4,969.30
  5. Step 5: Solve for x
    x = 4,969.30/75.78
  6. Step 6: Final answer
    x = 65.58

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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.