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Finding the Fourth Proportional to 353.76, 487.76 and 279.84

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Solution

The fourth proportional to 353.76, 487.76 and 279.84 is: 385.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.76 : 487.76 = 279.84 : x
  2. Step 2: Convert to fraction form
    353.76/487.76 = 279.84/x
  3. Step 3: Cross multiply
    353.76x = 487.76 × 279.84
  4. Step 4: Simplify right side
    353.76x = 136,494.76
  5. Step 5: Solve for x
    x = 136,494.76/353.76
  6. Step 6: Final answer
    x = 385.84

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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.