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Finding the Fourth Proportional to 279.08, 386.75 and 275.16

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Solution

The fourth proportional to 279.08, 386.75 and 275.16 is: 381.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.08 : 386.75 = 275.16 : x
  2. Step 2: Convert to fraction form
    279.08/386.75 = 275.16/x
  3. Step 3: Cross multiply
    279.08x = 386.75 × 275.16
  4. Step 4: Simplify right side
    279.08x = 106,418.82
  5. Step 5: Solve for x
    x = 106,418.82/279.08
  6. Step 6: Final answer
    x = 381.33

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.