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Finding the Fourth Proportional to 105.94, 158.10 and 103.20

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Solution

The fourth proportional to 105.94, 158.10 and 103.20 is: 154.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.94 : 158.10 = 103.20 : x
  2. Step 2: Convert to fraction form
    105.94/158.10 = 103.20/x
  3. Step 3: Cross multiply
    105.94x = 158.10 × 103.20
  4. Step 4: Simplify right side
    105.94x = 16,315.92
  5. Step 5: Solve for x
    x = 16,315.92/105.94
  6. Step 6: Final answer
    x = 154.02

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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.