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Finding the Fourth Proportional to 279.57, 386.42 and 253.44

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Solution

The fourth proportional to 279.57, 386.42 and 253.44 is: 350.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.57 : 386.42 = 253.44 : x
  2. Step 2: Convert to fraction form
    279.57/386.42 = 253.44/x
  3. Step 3: Cross multiply
    279.57x = 386.42 × 253.44
  4. Step 4: Simplify right side
    279.57x = 97,933.02
  5. Step 5: Solve for x
    x = 97,933.02/279.57
  6. Step 6: Final answer
    x = 350.30

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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.