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Finding the Fourth Proportional to 105.73, 158.64 and 90.74

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Solution

The fourth proportional to 105.73, 158.64 and 90.74 is: 136.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.73 : 158.64 = 90.74 : x
  2. Step 2: Convert to fraction form
    105.73/158.64 = 90.74/x
  3. Step 3: Cross multiply
    105.73x = 158.64 × 90.74
  4. Step 4: Simplify right side
    105.73x = 14,394.99
  5. Step 5: Solve for x
    x = 14,394.99/105.73
  6. Step 6: Final answer
    x = 136.16

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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.