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Finding the Fourth Proportional to 648.11, 894.56 and 399.64

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Solution

The fourth proportional to 648.11, 894.56 and 399.64 is: 551.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.11 : 894.56 = 399.64 : x
  2. Step 2: Convert to fraction form
    648.11/894.56 = 399.64/x
  3. Step 3: Cross multiply
    648.11x = 894.56 × 399.64
  4. Step 4: Simplify right side
    648.11x = 357,495.49
  5. Step 5: Solve for x
    x = 357,495.49/648.11
  6. Step 6: Final answer
    x = 551.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.