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Finding the Fourth Proportional to 328.79, 493.59 and 311.78

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Solution

The fourth proportional to 328.79, 493.59 and 311.78 is: 468.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.79 : 493.59 = 311.78 : x
  2. Step 2: Convert to fraction form
    328.79/493.59 = 311.78/x
  3. Step 3: Cross multiply
    328.79x = 493.59 × 311.78
  4. Step 4: Simplify right side
    328.79x = 153,889.02
  5. Step 5: Solve for x
    x = 153,889.02/328.79
  6. Step 6: Final answer
    x = 468.05

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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.