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Finding the Fourth Proportional to 648.30, 971.96 and 323.90

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Solution

The fourth proportional to 648.30, 971.96 and 323.90 is: 485.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.30 : 971.96 = 323.90 : x
  2. Step 2: Convert to fraction form
    648.30/971.96 = 323.90/x
  3. Step 3: Cross multiply
    648.30x = 971.96 × 323.90
  4. Step 4: Simplify right side
    648.30x = 314,811.36
  5. Step 5: Solve for x
    x = 314,811.36/648.30
  6. Step 6: Final answer
    x = 485.60

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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.