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Finding the Fourth Proportional to 103.73, 155.14 and 90.59

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Solution

The fourth proportional to 103.73, 155.14 and 90.59 is: 135.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.73 : 155.14 = 90.59 : x
  2. Step 2: Convert to fraction form
    103.73/155.14 = 90.59/x
  3. Step 3: Cross multiply
    103.73x = 155.14 × 90.59
  4. Step 4: Simplify right side
    103.73x = 14,053.13
  5. Step 5: Solve for x
    x = 14,053.13/103.73
  6. Step 6: Final answer
    x = 135.48

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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.