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Finding the Fourth Proportional to 165.04, 247.89 and 145.21

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Solution

The fourth proportional to 165.04, 247.89 and 145.21 is: 218.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.04 : 247.89 = 145.21 : x
  2. Step 2: Convert to fraction form
    165.04/247.89 = 145.21/x
  3. Step 3: Cross multiply
    165.04x = 247.89 × 145.21
  4. Step 4: Simplify right side
    165.04x = 35,996.50
  5. Step 5: Solve for x
    x = 35,996.50/165.04
  6. Step 6: Final answer
    x = 218.11

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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.