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Finding the Fourth Proportional to 328.37, 492.38 and 212.87

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Solution

The fourth proportional to 328.37, 492.38 and 212.87 is: 319.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.37 : 492.38 = 212.87 : x
  2. Step 2: Convert to fraction form
    328.37/492.38 = 212.87/x
  3. Step 3: Cross multiply
    328.37x = 492.38 × 212.87
  4. Step 4: Simplify right side
    328.37x = 104,812.93
  5. Step 5: Solve for x
    x = 104,812.93/328.37
  6. Step 6: Final answer
    x = 319.19

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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.