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Finding the Fourth Proportional to 153.45, 229.80 and 105.21

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Solution

The fourth proportional to 153.45, 229.80 and 105.21 is: 157.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.45 : 229.80 = 105.21 : x
  2. Step 2: Convert to fraction form
    153.45/229.80 = 105.21/x
  3. Step 3: Cross multiply
    153.45x = 229.80 × 105.21
  4. Step 4: Simplify right side
    153.45x = 24,177.26
  5. Step 5: Solve for x
    x = 24,177.26/153.45
  6. Step 6: Final answer
    x = 157.56

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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.