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Finding the Fourth Proportional to 492.70, 679.96 and 459.90

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Solution

The fourth proportional to 492.70, 679.96 and 459.90 is: 634.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.70 : 679.96 = 459.90 : x
  2. Step 2: Convert to fraction form
    492.70/679.96 = 459.90/x
  3. Step 3: Cross multiply
    492.70x = 679.96 × 459.90
  4. Step 4: Simplify right side
    492.70x = 312,713.60
  5. Step 5: Solve for x
    x = 312,713.60/492.70
  6. Step 6: Final answer
    x = 634.69

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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.