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Finding the Fourth Proportional to 279.84, 386.28 and 253.92

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Solution

The fourth proportional to 279.84, 386.28 and 253.92 is: 350.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.84 : 386.28 = 253.92 : x
  2. Step 2: Convert to fraction form
    279.84/386.28 = 253.92/x
  3. Step 3: Cross multiply
    279.84x = 386.28 × 253.92
  4. Step 4: Simplify right side
    279.84x = 98,084.22
  5. Step 5: Solve for x
    x = 98,084.22/279.84
  6. Step 6: Final answer
    x = 350.50

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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.