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Finding the Fourth Proportional to 468.36, 646.31 and 281.81

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Solution

The fourth proportional to 468.36, 646.31 and 281.81 is: 388.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.36 : 646.31 = 281.81 : x
  2. Step 2: Convert to fraction form
    468.36/646.31 = 281.81/x
  3. Step 3: Cross multiply
    468.36x = 646.31 × 281.81
  4. Step 4: Simplify right side
    468.36x = 182,133.39
  5. Step 5: Solve for x
    x = 182,133.39/468.36
  6. Step 6: Final answer
    x = 388.87

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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.