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Finding the Fourth Proportional to 103.62, 155.43 and 78.27

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Solution

The fourth proportional to 103.62, 155.43 and 78.27 is: 117.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.62 : 155.43 = 78.27 : x
  2. Step 2: Convert to fraction form
    103.62/155.43 = 78.27/x
  3. Step 3: Cross multiply
    103.62x = 155.43 × 78.27
  4. Step 4: Simplify right side
    103.62x = 12,165.51
  5. Step 5: Solve for x
    x = 12,165.51/103.62
  6. Step 6: Final answer
    x = 117.41

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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.