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Finding the Fourth Proportional to 328.77, 493.39 and 212.93

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Solution

The fourth proportional to 328.77, 493.39 and 212.93 is: 319.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.77 : 493.39 = 212.93 : x
  2. Step 2: Convert to fraction form
    328.77/493.39 = 212.93/x
  3. Step 3: Cross multiply
    328.77x = 493.39 × 212.93
  4. Step 4: Simplify right side
    328.77x = 105,056.47
  5. Step 5: Solve for x
    x = 105,056.47/328.77
  6. Step 6: Final answer
    x = 319.54

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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.