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Finding the Fourth Proportional to 489.52, 675.68 and 279.81

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Solution

The fourth proportional to 489.52, 675.68 and 279.81 is: 386.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.52 : 675.68 = 279.81 : x
  2. Step 2: Convert to fraction form
    489.52/675.68 = 279.81/x
  3. Step 3: Cross multiply
    489.52x = 675.68 × 279.81
  4. Step 4: Simplify right side
    489.52x = 189,062.02
  5. Step 5: Solve for x
    x = 189,062.02/489.52
  6. Step 6: Final answer
    x = 386.22

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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.