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Finding the Fourth Proportional to 333.74, 500.21 and 138.70

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Solution

The fourth proportional to 333.74, 500.21 and 138.70 is: 207.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    333.74 : 500.21 = 138.70 : x
  2. Step 2: Convert to fraction form
    333.74/500.21 = 138.70/x
  3. Step 3: Cross multiply
    333.74x = 500.21 × 138.70
  4. Step 4: Simplify right side
    333.74x = 69,376.77
  5. Step 5: Solve for x
    x = 69,376.77/333.74
  6. Step 6: Final answer
    x = 207.88

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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.