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Finding the Fourth Proportional to 328.68, 452.88 and 311.58

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Solution

The fourth proportional to 328.68, 452.88 and 311.58 is: 429.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.68 : 452.88 = 311.58 : x
  2. Step 2: Convert to fraction form
    328.68/452.88 = 311.58/x
  3. Step 3: Cross multiply
    328.68x = 452.88 × 311.58
  4. Step 4: Simplify right side
    328.68x = 141,108.35
  5. Step 5: Solve for x
    x = 141,108.35/328.68
  6. Step 6: Final answer
    x = 429.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.