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Finding the Fourth Proportional to 492.68, 679.87 and 315.39

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Solution

The fourth proportional to 492.68, 679.87 and 315.39 is: 435.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.68 : 679.87 = 315.39 : x
  2. Step 2: Convert to fraction form
    492.68/679.87 = 315.39/x
  3. Step 3: Cross multiply
    492.68x = 679.87 × 315.39
  4. Step 4: Simplify right side
    492.68x = 214,422.04
  5. Step 5: Solve for x
    x = 214,422.04/492.68
  6. Step 6: Final answer
    x = 435.22

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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.