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Finding the Fourth Proportional to 78.78, 117.99 and 75.26

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Solution

The fourth proportional to 78.78, 117.99 and 75.26 is: 112.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.78 : 117.99 = 75.26 : x
  2. Step 2: Convert to fraction form
    78.78/117.99 = 75.26/x
  3. Step 3: Cross multiply
    78.78x = 117.99 × 75.26
  4. Step 4: Simplify right side
    78.78x = 8,880.22
  5. Step 5: Solve for x
    x = 8,880.22/78.78
  6. Step 6: Final answer
    x = 112.72

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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.