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Finding the Fourth Proportional to 335.31, 502.90 and 129.81

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Solution

The fourth proportional to 335.31, 502.90 and 129.81 is: 194.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    335.31 : 502.90 = 129.81 : x
  2. Step 2: Convert to fraction form
    335.31/502.90 = 129.81/x
  3. Step 3: Cross multiply
    335.31x = 502.90 × 129.81
  4. Step 4: Simplify right side
    335.31x = 65,281.45
  5. Step 5: Solve for x
    x = 65,281.45/335.31
  6. Step 6: Final answer
    x = 194.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.