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Finding the Fourth Proportional to 386.84, 532.48 and 331.48

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Solution

The fourth proportional to 386.84, 532.48 and 331.48 is: 456.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.84 : 532.48 = 331.48 : x
  2. Step 2: Convert to fraction form
    386.84/532.48 = 331.48/x
  3. Step 3: Cross multiply
    386.84x = 532.48 × 331.48
  4. Step 4: Simplify right side
    386.84x = 176,506.47
  5. Step 5: Solve for x
    x = 176,506.47/386.84
  6. Step 6: Final answer
    x = 456.28

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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.