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Finding the Fourth Proportional to 648.54, 972.33 and 215.58

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Solution

The fourth proportional to 648.54, 972.33 and 215.58 is: 323.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.54 : 972.33 = 215.58 : x
  2. Step 2: Convert to fraction form
    648.54/972.33 = 215.58/x
  3. Step 3: Cross multiply
    648.54x = 972.33 × 215.58
  4. Step 4: Simplify right side
    648.54x = 209,614.90
  5. Step 5: Solve for x
    x = 209,614.90/648.54
  6. Step 6: Final answer
    x = 323.21

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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.