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Finding the Fourth Proportional to 478.93, 660.92 and 279.89

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Solution

The fourth proportional to 478.93, 660.92 and 279.89 is: 386.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.93 : 660.92 = 279.89 : x
  2. Step 2: Convert to fraction form
    478.93/660.92 = 279.89/x
  3. Step 3: Cross multiply
    478.93x = 660.92 × 279.89
  4. Step 4: Simplify right side
    478.93x = 184,986.68
  5. Step 5: Solve for x
    x = 184,986.68/478.93
  6. Step 6: Final answer
    x = 386.25

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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.