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Finding the Fourth Proportional to 492.69, 679.87 and 282.86

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Solution

The fourth proportional to 492.69, 679.87 and 282.86 is: 390.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.69 : 679.87 = 282.86 : x
  2. Step 2: Convert to fraction form
    492.69/679.87 = 282.86/x
  3. Step 3: Cross multiply
    492.69x = 679.87 × 282.86
  4. Step 4: Simplify right side
    492.69x = 192,308.03
  5. Step 5: Solve for x
    x = 192,308.03/492.69
  6. Step 6: Final answer
    x = 390.32

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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.