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Finding the Fourth Proportional to 478.85, 660.89 and 279.72

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Solution

The fourth proportional to 478.85, 660.89 and 279.72 is: 386.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.85 : 660.89 = 279.72 : x
  2. Step 2: Convert to fraction form
    478.85/660.89 = 279.72/x
  3. Step 3: Cross multiply
    478.85x = 660.89 × 279.72
  4. Step 4: Simplify right side
    478.85x = 184,864.85
  5. Step 5: Solve for x
    x = 184,864.85/478.85
  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.