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Finding the Fourth Proportional to 154.70, 213.50 and 105.62

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Solution

The fourth proportional to 154.70, 213.50 and 105.62 is: 145.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.70 : 213.50 = 105.62 : x
  2. Step 2: Convert to fraction form
    154.70/213.50 = 105.62/x
  3. Step 3: Cross multiply
    154.70x = 213.50 × 105.62
  4. Step 4: Simplify right side
    154.70x = 22,549.87
  5. Step 5: Solve for x
    x = 22,549.87/154.70
  6. Step 6: Final answer
    x = 145.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.