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Finding the Fourth Proportional to 328.51, 492.90 and 212.92

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Solution

The fourth proportional to 328.51, 492.90 and 212.92 is: 319.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.51 : 492.90 = 212.92 : x
  2. Step 2: Convert to fraction form
    328.51/492.90 = 212.92/x
  3. Step 3: Cross multiply
    328.51x = 492.90 × 212.92
  4. Step 4: Simplify right side
    328.51x = 104,948.27
  5. Step 5: Solve for x
    x = 104,948.27/328.51
  6. Step 6: Final answer
    x = 319.47

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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.