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Finding the Fourth Proportional to 162.45, 243.61 and 54.21

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Solution

The fourth proportional to 162.45, 243.61 and 54.21 is: 81.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.45 : 243.61 = 54.21 : x
  2. Step 2: Convert to fraction form
    162.45/243.61 = 54.21/x
  3. Step 3: Cross multiply
    162.45x = 243.61 × 54.21
  4. Step 4: Simplify right side
    162.45x = 13,206.10
  5. Step 5: Solve for x
    x = 13,206.10/162.45
  6. Step 6: Final answer
    x = 81.29

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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.