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Finding the Fourth Proportional to 103.90, 155.79 and 45.28

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Solution

The fourth proportional to 103.90, 155.79 and 45.28 is: 67.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.90 : 155.79 = 45.28 : x
  2. Step 2: Convert to fraction form
    103.90/155.79 = 45.28/x
  3. Step 3: Cross multiply
    103.90x = 155.79 × 45.28
  4. Step 4: Simplify right side
    103.90x = 7,054.17
  5. Step 5: Solve for x
    x = 7,054.17/103.90
  6. Step 6: Final answer
    x = 67.89

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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.