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Finding the Fourth Proportional to 104.60, 155.94 and 90.23

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Solution

The fourth proportional to 104.60, 155.94 and 90.23 is: 134.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.60 : 155.94 = 90.23 : x
  2. Step 2: Convert to fraction form
    104.60/155.94 = 90.23/x
  3. Step 3: Cross multiply
    104.60x = 155.94 × 90.23
  4. Step 4: Simplify right side
    104.60x = 14,069.35
  5. Step 5: Solve for x
    x = 14,069.35/104.60
  6. Step 6: Final answer
    x = 134.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.