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Finding the Fourth Proportional to 335.20, 502.78 and 91.74

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Solution

The fourth proportional to 335.20, 502.78 and 91.74 is: 137.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    335.20 : 502.78 = 91.74 : x
  2. Step 2: Convert to fraction form
    335.20/502.78 = 91.74/x
  3. Step 3: Cross multiply
    335.20x = 502.78 × 91.74
  4. Step 4: Simplify right side
    335.20x = 46,125.04
  5. Step 5: Solve for x
    x = 46,125.04/335.20
  6. Step 6: Final answer
    x = 137.60

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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.