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Finding the Fourth Proportional to 478.86, 660.84 and 279.75

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Solution

The fourth proportional to 478.86, 660.84 and 279.75 is: 386.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.86 : 660.84 = 279.75 : x
  2. Step 2: Convert to fraction form
    478.86/660.84 = 279.75/x
  3. Step 3: Cross multiply
    478.86x = 660.84 × 279.75
  4. Step 4: Simplify right side
    478.86x = 184,869.99
  5. Step 5: Solve for x
    x = 184,869.99/478.86
  6. Step 6: Final answer
    x = 386.06

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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.