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Finding the Fourth Proportional to 386.12, 533.31 and 281.04

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Solution

The fourth proportional to 386.12, 533.31 and 281.04 is: 388.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.12 : 533.31 = 281.04 : x
  2. Step 2: Convert to fraction form
    386.12/533.31 = 281.04/x
  3. Step 3: Cross multiply
    386.12x = 533.31 × 281.04
  4. Step 4: Simplify right side
    386.12x = 149,878.39
  5. Step 5: Solve for x
    x = 149,878.39/386.12
  6. Step 6: Final answer
    x = 388.17

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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.