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Finding the Fourth Proportional to 161.88, 242.61 and 147.72

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Solution

The fourth proportional to 161.88, 242.61 and 147.72 is: 221.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.88 : 242.61 = 147.72 : x
  2. Step 2: Convert to fraction form
    161.88/242.61 = 147.72/x
  3. Step 3: Cross multiply
    161.88x = 242.61 × 147.72
  4. Step 4: Simplify right side
    161.88x = 35,838.35
  5. Step 5: Solve for x
    x = 35,838.35/161.88
  6. Step 6: Final answer
    x = 221.39

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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.