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Finding the Fourth Proportional to 662.72, 993.36 and 320

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Solution

The fourth proportional to 662.72, 993.36 and 320 is: 479.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.72 : 993.36 = 320 : x
  2. Step 2: Convert to fraction form
    662.72/993.36 = 320/x
  3. Step 3: Cross multiply
    662.72x = 993.36 × 320
  4. Step 4: Simplify right side
    662.72x = 317,875.20
  5. Step 5: Solve for x
    x = 317,875.20/662.72
  6. Step 6: Final answer
    x = 479.65

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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.