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Finding the Fourth Proportional to 993.51, 1,489.82 and 531.21

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Solution

The fourth proportional to 993.51, 1,489.82 and 531.21 is: 796.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.51 : 1,489.82 = 531.21 : x
  2. Step 2: Convert to fraction form
    993.51/1,489.82 = 531.21/x
  3. Step 3: Cross multiply
    993.51x = 1,489.82 × 531.21
  4. Step 4: Simplify right side
    993.51x = 791,404.63
  5. Step 5: Solve for x
    x = 791,404.63/993.51
  6. Step 6: Final answer
    x = 796.57

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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.