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Finding the Fourth Proportional to 328.95, 494.12 and 207.30

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Solution

The fourth proportional to 328.95, 494.12 and 207.30 is: 311.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.95 : 494.12 = 207.30 : x
  2. Step 2: Convert to fraction form
    328.95/494.12 = 207.30/x
  3. Step 3: Cross multiply
    328.95x = 494.12 × 207.30
  4. Step 4: Simplify right side
    328.95x = 102,429.74
  5. Step 5: Solve for x
    x = 102,429.74/328.95
  6. Step 6: Final answer
    x = 311.38

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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.