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Finding the Fourth Proportional to 78.05, 116.89 and 45.92

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Solution

The fourth proportional to 78.05, 116.89 and 45.92 is: 68.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.05 : 116.89 = 45.92 : x
  2. Step 2: Convert to fraction form
    78.05/116.89 = 45.92/x
  3. Step 3: Cross multiply
    78.05x = 116.89 × 45.92
  4. Step 4: Simplify right side
    78.05x = 5,367.59
  5. Step 5: Solve for x
    x = 5,367.59/78.05
  6. Step 6: Final answer
    x = 68.77

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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.