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Finding the Fourth Proportional to 78.50, 117.78 and 23.66

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Solution

The fourth proportional to 78.50, 117.78 and 23.66 is: 35.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.50 : 117.78 = 23.66 : x
  2. Step 2: Convert to fraction form
    78.50/117.78 = 23.66/x
  3. Step 3: Cross multiply
    78.50x = 117.78 × 23.66
  4. Step 4: Simplify right side
    78.50x = 2,786.47
  5. Step 5: Solve for x
    x = 2,786.47/78.50
  6. Step 6: Final answer
    x = 35.49

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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.