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Finding the Fourth Proportional to 328.23, 492.08 and 145.80

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Solution

The fourth proportional to 328.23, 492.08 and 145.80 is: 218.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.23 : 492.08 = 145.80 : x
  2. Step 2: Convert to fraction form
    328.23/492.08 = 145.80/x
  3. Step 3: Cross multiply
    328.23x = 492.08 × 145.80
  4. Step 4: Simplify right side
    328.23x = 71,744.54
  5. Step 5: Solve for x
    x = 71,744.54/328.23
  6. Step 6: Final answer
    x = 218.58

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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.