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Finding the Fourth Proportional to 993.14, 1,489.86 and 343.72

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Solution

The fourth proportional to 993.14, 1,489.86 and 343.72 is: 515.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.14 : 1,489.86 = 343.72 : x
  2. Step 2: Convert to fraction form
    993.14/1,489.86 = 343.72/x
  3. Step 3: Cross multiply
    993.14x = 1,489.86 × 343.72
  4. Step 4: Simplify right side
    993.14x = 512,087.23
  5. Step 5: Solve for x
    x = 512,087.23/993.14
  6. Step 6: Final answer
    x = 515.62

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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.