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Finding the Fourth Proportional to 667.60, 921.20 and 384

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Solution

The fourth proportional to 667.60, 921.20 and 384 is: 529.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.60 : 921.20 = 384 : x
  2. Step 2: Convert to fraction form
    667.60/921.20 = 384/x
  3. Step 3: Cross multiply
    667.60x = 921.20 × 384
  4. Step 4: Simplify right side
    667.60x = 353,740.80
  5. Step 5: Solve for x
    x = 353,740.80/667.60
  6. Step 6: Final answer
    x = 529.87

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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.