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Finding the Fourth Proportional to 256.37, 386.17 and 253.17

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Solution

The fourth proportional to 256.37, 386.17 and 253.17 is: 381.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.37 : 386.17 = 253.17 : x
  2. Step 2: Convert to fraction form
    256.37/386.17 = 253.17/x
  3. Step 3: Cross multiply
    256.37x = 386.17 × 253.17
  4. Step 4: Simplify right side
    256.37x = 97,766.03
  5. Step 5: Solve for x
    x = 97,766.03/256.37
  6. Step 6: Final answer
    x = 381.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.