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Finding the Fourth Proportional to 78.36, 107.97 and 53.75

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Solution

The fourth proportional to 78.36, 107.97 and 53.75 is: 74.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.36 : 107.97 = 53.75 : x
  2. Step 2: Convert to fraction form
    78.36/107.97 = 53.75/x
  3. Step 3: Cross multiply
    78.36x = 107.97 × 53.75
  4. Step 4: Simplify right side
    78.36x = 5,802.85
  5. Step 5: Solve for x
    x = 5,802.85/78.36
  6. Step 6: Final answer
    x = 74.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.