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Finding the Fourth Proportional to 648.89, 973.32 and 388.96

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Solution

The fourth proportional to 648.89, 973.32 and 388.96 is: 583.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.89 : 973.32 = 388.96 : x
  2. Step 2: Convert to fraction form
    648.89/973.32 = 388.96/x
  3. Step 3: Cross multiply
    648.89x = 973.32 × 388.96
  4. Step 4: Simplify right side
    648.89x = 378,582.55
  5. Step 5: Solve for x
    x = 378,582.55/648.89
  6. Step 6: Final answer
    x = 583.43

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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.