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Finding the Fourth Proportional to 268.16, 403.20 and 253.68

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Solution

The fourth proportional to 268.16, 403.20 and 253.68 is: 381.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.16 : 403.20 = 253.68 : x
  2. Step 2: Convert to fraction form
    268.16/403.20 = 253.68/x
  3. Step 3: Cross multiply
    268.16x = 403.20 × 253.68
  4. Step 4: Simplify right side
    268.16x = 102,283.78
  5. Step 5: Solve for x
    x = 102,283.78/268.16
  6. Step 6: Final answer
    x = 381.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.