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Finding the Fourth Proportional to 384.60, 528.70 and 331.23

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Solution

The fourth proportional to 384.60, 528.70 and 331.23 is: 455.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.60 : 528.70 = 331.23 : x
  2. Step 2: Convert to fraction form
    384.60/528.70 = 331.23/x
  3. Step 3: Cross multiply
    384.60x = 528.70 × 331.23
  4. Step 4: Simplify right side
    384.60x = 175,121.30
  5. Step 5: Solve for x
    x = 175,121.30/384.60
  6. Step 6: Final answer
    x = 455.33

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.