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Finding the Fourth Proportional to 478.92, 660.90 and 279.88

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Solution

The fourth proportional to 478.92, 660.90 and 279.88 is: 386.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.92 : 660.90 = 279.88 : x
  2. Step 2: Convert to fraction form
    478.92/660.90 = 279.88/x
  3. Step 3: Cross multiply
    478.92x = 660.90 × 279.88
  4. Step 4: Simplify right side
    478.92x = 184,975.04
  5. Step 5: Solve for x
    x = 184,975.04/478.92
  6. Step 6: Final answer
    x = 386.24

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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.