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Finding the Fourth Proportional to 328.80, 493.36 and 310.40

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Solution

The fourth proportional to 328.80, 493.36 and 310.40 is: 465.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.80 : 493.36 = 310.40 : x
  2. Step 2: Convert to fraction form
    328.80/493.36 = 310.40/x
  3. Step 3: Cross multiply
    328.80x = 493.36 × 310.40
  4. Step 4: Simplify right side
    328.80x = 153,138.94
  5. Step 5: Solve for x
    x = 153,138.94/328.80
  6. Step 6: Final answer
    x = 465.75

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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.