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Finding the Fourth Proportional to 386.97, 534.12 and 256.17

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Solution

The fourth proportional to 386.97, 534.12 and 256.17 is: 353.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.97 : 534.12 = 256.17 : x
  2. Step 2: Convert to fraction form
    386.97/534.12 = 256.17/x
  3. Step 3: Cross multiply
    386.97x = 534.12 × 256.17
  4. Step 4: Simplify right side
    386.97x = 136,825.52
  5. Step 5: Solve for x
    x = 136,825.52/386.97
  6. Step 6: Final answer
    x = 353.58

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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.