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Finding the Fourth Proportional to 669.76, 1,005.12 and 328

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Solution

The fourth proportional to 669.76, 1,005.12 and 328 is: 492.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.76 : 1,005.12 = 328 : x
  2. Step 2: Convert to fraction form
    669.76/1,005.12 = 328/x
  3. Step 3: Cross multiply
    669.76x = 1,005.12 × 328
  4. Step 4: Simplify right side
    669.76x = 329,679.36
  5. Step 5: Solve for x
    x = 329,679.36/669.76
  6. Step 6: Final answer
    x = 492.24

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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.