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Finding the Fourth Proportional to 353.30, 487.35 and 279.86

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Solution

The fourth proportional to 353.30, 487.35 and 279.86 is: 386.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.30 : 487.35 = 279.86 : x
  2. Step 2: Convert to fraction form
    353.30/487.35 = 279.86/x
  3. Step 3: Cross multiply
    353.30x = 487.35 × 279.86
  4. Step 4: Simplify right side
    353.30x = 136,387.33
  5. Step 5: Solve for x
    x = 136,387.33/353.30
  6. Step 6: Final answer
    x = 386.04

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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.