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Finding the Fourth Proportional to 78.26, 117.38 and 55.37

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Solution

The fourth proportional to 78.26, 117.38 and 55.37 is: 83.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.26 : 117.38 = 55.37 : x
  2. Step 2: Convert to fraction form
    78.26/117.38 = 55.37/x
  3. Step 3: Cross multiply
    78.26x = 117.38 × 55.37
  4. Step 4: Simplify right side
    78.26x = 6,498.47
  5. Step 5: Solve for x
    x = 6,498.47/78.26
  6. Step 6: Final answer
    x = 83.04

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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.